Write down what changed for users since 4.6

CHANGELOG.md

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+# Changelog
+
+User-facing changes since 4.6. Rendering and format support come from the
+OpenDocument core engine the app is built on, so changes absorbed from it are
+listed here too.
+
+## 4.13.0
+
+- Saving is safer. A save that fails no longer leaves the original file damaged,
+  and saving a document that got shorter no longer leaves the tail of the old
+  file behind — which could make an .odt or .docx stop opening entirely.
+- A file the app recognises but cannot open now says so directly, with a way to
+  get in touch, instead of asking to upload it to the conversion service first.
+  The upload offer stays for formats the app genuinely does not support, such as
+  iWork, WordPerfect and DXF.
+- Audio and video files handed to the app now play, and archives, plain text,
+  images and fonts are shown by the engine.
+- The review prompt now appears only after a document you opened yourself, or on
+  the start screen, and never before the third use.
+
+## 4.12.0
+
+No user-facing changes. The engine is now taken from a prebuilt package, which
+makes the app buildable from source without a native toolchain.
+
+## 4.11.0
+
+- Presentations open in the app: .pptx and .ppt, along with legacy .xls and .doc,
+  are rendered by the built-in engine.
+- The list of formats the app accepts now comes from the engine itself instead of
+  a hand-maintained list. Templates, macro-enabled variants, flat XML flavours and
+  extensions such as .dot, .pot, .pps and .xlt are recognised where they were not
+  before.
+- .xlsb is no longer offered, because it cannot be opened. It used to be accepted
+  and then fail.
+- The Edit action now appears based on what the engine says about the open
+  document, rather than on its file type.
+- Uploading a file the conversion service refuses now reports the failure instead
+  of showing a browser error page.
+
+## 4.10.0
+
+- Engine update. Opening a document no longer fails when a network port is still
+  held from an earlier run.
+
+## 4.9.0
+
+- Fixed a crash on startup that could stop the app from launching at all.
+- Documents in the recently opened list can be opened again on a later launch.
+  Their entries used to become unreadable as soon as the app was closed.
+- Duplicates no longer pile up in the recently opened list.
+
+## 4.8.0
+
+No user-facing changes. Release and build process only.
+
+## 4.7
+
+A large engine update, replacing the two external rendering backends with the
+app's own implementations.
+
+**PDF**
+
+- Rendered by the built-in engine. Text is placed by its baseline, embedded fonts
+  (TrueType, CFF, Type1, Type3) are used where present and substituted where not,
+  and non-embedded fonts fall back to standard metrics.
+- Images, vector graphics, gradients, tiling patterns, clipping, transparency and
+  blend modes are drawn.
+- Password-protected PDFs can be opened, and damaged cross-reference tables are
+  recovered rather than rejected.
+- Links inside the document and to the web are clickable.
+- CJK text in older documents displays correctly.
+- Long documents are rendered page by page.
+
+**Word, Excel and PowerPoint**
+
+- The legacy .doc, .xls and .ppt formats are read by the built-in engine.
+  Character formatting, cell fonts and fills, pictures, slide sizes and slide
+  names are carried over.
+- .pptx slide dimensions and tables, .xlsx merged cells and cell value types, and
+  .docx merged table cells are handled.
+
+**OpenDocument**
+
+- Subscript and superscript, percentage line height and first-line indent are
+  applied.
+
+**App**
+
+- PDFs and images open fitted to the screen width on phones.
+- The app no longer offers itself for unrelated content such as contact cards. A
+  switch on the start screen restores the previous behaviour.
+- Pressing back in a document you opened from inside the app returns to the start
+  screen instead of closing the app. Documents opened from another app still
+  return to that app.
+- Page tabs are shown only for spreadsheets, one per sheet. Every other format
+  shows the whole document.
+- The suggestion to upload the file no longer appears after a document has
+  loaded successfully.
+- Fixed a crash when uploading a file on Android 6 and 7.
+- File type detection falls back to the file extension when the system reports an
+  unknown type.
+
+## 4.6
+
+No user-facing changes. Build and engine maintenance.

fastlane/metadata/android/en-US/changelogs/202.txt

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+Maintenance release: build and rendering engine updates, no visible changes.

fastlane/metadata/android/en-US/changelogs/203.txt

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+PDF is now drawn by our own engine: embedded fonts, images, vector graphics, transparency, clickable links, password-protected files and correct CJK text.
+
+The legacy .doc, .xls and .ppt formats are read by our own engine too, keeping character formatting, cell colours, pictures and slide sizes. Better .pptx, .xlsx and .docx tables.
+
+PDFs and images open fitted to the screen width. Back returns to the start screen. Page tabs only for spreadsheets.

fastlane/metadata/android/en-US/changelogs/204.txt

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+Maintenance release: no visible changes.

fastlane/metadata/android/en-US/changelogs/40900.txt

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+Fixed a crash on startup that could stop the app from launching.
+
+Documents in the recently opened list can be opened again on a later launch, and duplicates no longer pile up there.

fastlane/metadata/android/en-US/changelogs/41000.txt

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+Rendering engine update. Opening a document no longer fails when a network port is still held from an earlier run.

fastlane/metadata/android/en-US/changelogs/41100.txt

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+Presentations open in the app: .pptx and .ppt, along with legacy .xls and .doc.
+
+The list of formats we accept now comes from the rendering engine itself, so templates, macro-enabled files and extensions like .dot, .pot, .pps and .xlt are recognised. .xlsb is no longer offered, because it could never be opened.
+
+The Edit action now follows what the engine says about the open document.
+
+Uploading a file the conversion service refuses now reports the failure.

fastlane/metadata/android/en-US/changelogs/41200.txt

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+Maintenance release: no visible changes.

fastlane/metadata/android/en-US/changelogs/41300.txt

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+Saving is safer. A failed save no longer leaves the original file damaged, and saving a document that got shorter no longer leaves part of the old file behind, which could make an .odt or .docx stop opening.
+
+A file we recognise but cannot open now says so directly, with a way to get in touch. The upload offer stays for formats we do not support at all.
+
+Audio and video files handed to the app now play.
+
+The review prompt appears far less often.