diff --git a/src/app/features/registries/components/custom-step/custom-step.component.ts b/src/app/features/registries/components/custom-step/custom-step.component.ts
index 59721646c..e32768270 100644
--- a/src/app/features/registries/components/custom-step/custom-step.component.ts
+++ b/src/app/features/registries/components/custom-step/custom-step.component.ts
@@ -29,10 +29,11 @@ import { FormBuilder, FormControl, FormGroup, FormsModule, ReactiveFormsModule,
 import { ActivatedRoute, Router } from '@angular/router';
 
 import { InfoIconComponent } from '@osf/shared/components';
-import { INPUT_VALIDATION_MESSAGES } from '@osf/shared/constants';
+import { FILE_COUNT_ATTACHMENTS_LIMIT, INPUT_VALIDATION_MESSAGES } from '@osf/shared/constants';
 import { FieldType } from '@osf/shared/enums';
 import { CustomValidators, findChangedFields } from '@osf/shared/helpers';
 import { FilePayloadJsonApi, OsfFile, PageSchema } from '@osf/shared/models';
+import { ToastService } from '@osf/shared/services';
 
 import { FilesMapper } from '../../mappers/files.mapper';
 import { RegistriesSelectors, SetUpdatedFields, UpdateStepValidation } from '../../store';
@@ -77,6 +78,7 @@ export class CustomStepComponent implements OnDestroy {
   private readonly route = inject(ActivatedRoute);
   private readonly router = inject(Router);
   private readonly fb = inject(FormBuilder);
+  private toastService = inject(ToastService);
 
   readonly pages = select(RegistriesSelectors.getPagesSchema);
   readonly FieldType = FieldType;
@@ -180,7 +182,12 @@ export class CustomStepComponent implements OnDestroy {
 
   onAttachFile(file: OsfFile, questionKey: string): void {
     this.attachedFiles[questionKey] = this.attachedFiles[questionKey] || [];
+
     if (!this.attachedFiles[questionKey].some((f) => f.file_id === file.id)) {
+      if (this.attachedFiles[questionKey].length >= FILE_COUNT_ATTACHMENTS_LIMIT) {
+        this.toastService.showWarn('shared.files.limitText');
+        return;
+      }
       this.attachedFiles[questionKey].push(file);
       this.stepForm.patchValue({
         [questionKey]: [...(this.attachedFiles[questionKey] || []), file],
diff --git a/src/app/features/registries/components/files-control/files-control.component.html b/src/app/features/registries/components/files-control/files-control.component.html
index ea73def20..884f72428 100644
--- a/src/app/features/registries/components/files-control/files-control.component.html
+++ b/src/app/features/registries/components/files-control/files-control.component.html
@@ -58,7 +58,7 @@
       [isLoading]="isFilesLoading()"
       [actions]="filesTreeActions"
       [viewOnly]="filesViewOnly()"
-      [viewOnlyDownloadable]="false"
+      [viewOnlyDownloadable]="true"
       [resourceId]="projectId()"
       [provider]="provider()"
       (folderIsOpening)="folderIsOpening($event)"
diff --git a/src/app/features/registries/components/files-control/files-control.component.ts b/src/app/features/registries/components/files-control/files-control.component.ts
index 980a2763e..6bff47341 100644
--- a/src/app/features/registries/components/files-control/files-control.component.ts
+++ b/src/app/features/registries/components/files-control/files-control.component.ts
@@ -16,8 +16,9 @@ import { FormsModule, ReactiveFormsModule } from '@angular/forms';
 
 import { CreateFolderDialogComponent } from '@osf/features/files/components';
 import { FilesTreeComponent, LoadingSpinnerComponent } from '@osf/shared/components';
+import { FILE_SIZE_LIMIT } from '@osf/shared/constants';
 import { FilesTreeActions, OsfFile } from '@osf/shared/models';
-import { FilesService } from '@osf/shared/services';
+import { FilesService, ToastService } from '@osf/shared/services';
 
 import {
   CreateFolder,
@@ -57,6 +58,7 @@ export class FilesControlComponent {
   private readonly dialogService = inject(DialogService);
   private readonly translateService = inject(TranslateService);
   private readonly destroyRef = inject(DestroyRef);
+  private toastService = inject(ToastService);
 
   readonly files = select(RegistriesSelectors.getFiles);
   readonly filesTotalCount = select(RegistriesSelectors.getFilesTotalCount);
@@ -103,6 +105,10 @@ export class FilesControlComponent {
   onFileSelected(event: Event): void {
     const input = event.target as HTMLInputElement;
     const file = input.files?.[0];
+    if (file && file.size > FILE_SIZE_LIMIT) {
+      this.toastService.showWarn('shared.files.limitText');
+      return;
+    }
     if (!file) return;
 
     this.uploadFile(file);
diff --git a/src/app/features/registries/components/metadata/metadata.component.html b/src/app/features/registries/components/metadata/metadata.component.html
index 620c66986..75d6a4897 100644
--- a/src/app/features/registries/components/metadata/metadata.component.html
+++ b/src/app/features/registries/components/metadata/metadata.component.html
@@ -11,7 +11,7 @@ <h2 class="mb-2">{{ 'common.labels.title' | translate }}</h2>
         </label>
         <p class="mb-1">{{ 'shared.title.description' | translate }}</p>
         <osf-text-input
-          id="registration-title-id"
+          [inputId]="'registration-title-id'"
           [control]="metadataForm.controls['title']"
           [maxLength]="inputLimits.fullName.maxLength"
         >
@@ -33,6 +33,7 @@ <h2>{{ 'common.labels.description' | translate }}</h2>
             rows="5"
             cols="30"
             pTextarea
+            [ariaLabel]="'common.labels.description' | translate"
           ></textarea>
           @if (
             metadataForm.controls['description'].errors?.['required'] &&
diff --git a/src/app/shared/components/stepper/stepper.component.html b/src/app/shared/components/stepper/stepper.component.html
index 7089f1300..6e5549af5 100644
--- a/src/app/shared/components/stepper/stepper.component.html
+++ b/src/app/shared/components/stepper/stepper.component.html
@@ -9,6 +9,7 @@
           [class.invalid]="step.invalid"
           [class.current]="i === currentStep().index"
           (click)="onStepClick(step)"
+          [attr.aria-label]="step.label | translate"
         >
           @if (step.invalid && i !== currentStep().index) {
             <osf-icon iconClass="fas fa-exclamation" />
diff --git a/src/app/shared/components/subjects/subjects.component.html b/src/app/shared/components/subjects/subjects.component.html
index 862ae009e..e647ef075 100644
--- a/src/app/shared/components/subjects/subjects.component.html
+++ b/src/app/shared/components/subjects/subjects.component.html
@@ -69,6 +69,7 @@ <h2 class="mb-2">{{ 'shared.subjects.title' | translate }}</h2>
       (onNodeSelect)="selectSubject($event.node.data)"
       (onNodeUnselect)="removeSubject($event.node.data)"
       [ariaLabel]="'shared.subjects.subjectTree' | translate"
+      [togglerAriaLabel]="'common.accessibility.toggleTreeNode' | translate"
     >
     </p-tree>
   }
diff --git a/src/app/shared/components/text-input/text-input.component.html b/src/app/shared/components/text-input/text-input.component.html
index 59f592760..23fdb6139 100644
--- a/src/app/shared/components/text-input/text-input.component.html
+++ b/src/app/shared/components/text-input/text-input.component.html
@@ -1,8 +1,8 @@
 @if (label()) {
-  <label [for]="inputId">{{ label() | translate }}</label>
+  <label [for]="inputId()">{{ label() | translate }}</label>
 }
 <input
-  [id]="inputId"
+  [id]="inputId()"
   pInputText
   [type]="type()"
   [formControl]="control()"
diff --git a/src/app/shared/components/text-input/text-input.component.ts b/src/app/shared/components/text-input/text-input.component.ts
index 4a7a027d0..b1c708bb8 100644
--- a/src/app/shared/components/text-input/text-input.component.ts
+++ b/src/app/shared/components/text-input/text-input.component.ts
@@ -25,7 +25,7 @@ export class TextInputComponent {
   minLength = input<number>();
   maxLength = input<number>();
 
-  inputId = `input-${Math.random().toString(36).substring(2, 15)}`;
+  inputId = input<string>(`input-${Math.random().toString(36).substring(2, 15)}`);
   helpId = `help-${Math.random().toString(36).substring(2, 15)}`;
 
   getErrorMessage(): ValidationParams {
diff --git a/src/app/shared/constants/files-limits.const.ts b/src/app/shared/constants/files-limits.const.ts
new file mode 100644
index 000000000..0f8156270
--- /dev/null
+++ b/src/app/shared/constants/files-limits.const.ts
@@ -0,0 +1,2 @@
+export const FILE_SIZE_LIMIT = 5 * 1024 * 1024 * 1024;
+export const FILE_COUNT_ATTACHMENTS_LIMIT = 1;
diff --git a/src/app/shared/constants/index.ts b/src/app/shared/constants/index.ts
index 6d9b00431..e8aadc9a5 100644
--- a/src/app/shared/constants/index.ts
+++ b/src/app/shared/constants/index.ts
@@ -4,6 +4,7 @@ export * from './addons-tab-options.const';
 export * from './contributors.constants';
 export * from './default-citation-titles.const';
 export * from './default-table-params.constants';
+export * from './files-limits.const';
 export * from './filter-placeholders';
 export * from './input-limits.const';
 export * from './input-validation-messages.const';
diff --git a/src/app/shared/services/toast.service.ts b/src/app/shared/services/toast.service.ts
index da6ac62e1..dae505bee 100644
--- a/src/app/shared/services/toast.service.ts
+++ b/src/app/shared/services/toast.service.ts
@@ -13,7 +13,7 @@ export class ToastService {
   }
 
   showWarn(summary: string, params?: unknown) {
-    this.messageService.add({ severity: 'warn', summary, data: { translationParams: params }, key: 'osf' });
+    this.messageService.add({ severity: 'warn', summary, life: 5000, data: { translationParams: params }, key: 'osf' });
   }
 
   showError(summary: string, params?: unknown) {
diff --git a/src/assets/i18n/en.json b/src/assets/i18n/en.json
index 31123445a..4c8313ca2 100644
--- a/src/assets/i18n/en.json
+++ b/src/assets/i18n/en.json
@@ -65,6 +65,7 @@
       "customizeOptions": "Customize options",
       "toggleProjectVisibility": "Toggle project visibility",
       "tagInput": "Tag input",
+      "toggleTreeNode": "Toggle tree node",
       "copyButtonInfo": "Copy to clipboard button"
     },
     "dialogs": {