update the custom_build test configuration

cypress/e2e/custom_build/.chainlit/config.toml

@@ -12,7 +12,7 @@ session_timeout = 3600
 # Enable third parties caching (e.g LangChain cache)
 cache = false
 
-# Authorized origins 
+# Authorized origins
 allow_origins = ["*"]
 
 # Follow symlink for asset mount (see https://github.com/Chainlit/chainlit/issues/317)
@@ -29,7 +29,11 @@ unsafe_allow_html = false
 latex = false
 
 # Authorize users to upload files with messages
-multi_modal = true
+[features.multi_modal]
+    enabled = true
+    accept = ["*/*"]
+    max_files = 20
+    max_size_mb = 500
 
 # Allows user to use speech to text
 [features.speech_to_text]
@@ -72,6 +76,7 @@ hide_cot = false
 
 # Specify a custom build directory for the frontend. 
 # This can be used to customize the frontend code.
+# Be careful: If this is a relative path, it should not start with a slash.
 custom_build = "./public/build"
 
 # Override default MUI light theme. (Check theme.ts)
@@ -98,4 +103,4 @@ custom_build = "./public/build"
 
 
 [meta]
-generated_by = "1.0.301"
+generated_by = "1.0.301"