Fixed attached files silently reaching the AI as empty documents (#904)

app/MindWork AI Studio/wwwroot/changelog/v26.8.1.md

@@ -8,7 +8,20 @@
 - Added a priority for configuration plugins. Organizations that deploy several configurations can now decide which one wins: a configuration with a higher priority overrides the settings and providers of a lower one. This allows a company-wide base configuration that each department refines for itself.
 - Added a way for IT departments to try out a configuration before rolling it out. A configuration placed in the new `.config-tests` directory below the plugins directory acts like one your organization deployed, including the approval of assistant plugins, so a test shows exactly what colleagues will see later. No configuration server is needed for this. AI Studio empties that directory every time it starts, so a test configuration is valid for one session, and the information page reports it while it is active. The Enterprise IT documentation describes the whole procedure.
 - Improved how your organization's configuration behaves when a configuration plugin is present but cannot be loaded, e.g. because of an error in the plugin. Such a plugin still manages your app, so its settings, providers, data sources, profiles, and chat templates now stay in place instead of being removed.
+- Added CSV and TSV files to the file types you can attach. AI Studio was already able to read them, but they could not be selected.
+- Improved reading large files from slow locations such as network drives. AI Studio now waits considerably longer before it gives up, and it tells you when it does.
 - Changed how approvals for assistant plugins combine when your organization deploys several configurations. They now add up, so a department can approve additional assistant plugins without repeating the approvals of the company-wide configuration. Previously, the last configuration replaced all earlier approvals, which silently required a new security check for those assistants.
+- Fixed attached files reaching the AI as empty documents when AI Studio could not read them. The AI then answered as if your file had no content, and nothing pointed to a problem. AI Studio now names the cause instead, for example an unavailable network drive, a file another program is blocking, a protected PDF, or a scanned PDF without a text layer, and it no longer attaches such a file.
+- Fixed files that are open in another program being reported as an unrecognized file type. AI Studio now tells you that the file is currently open elsewhere and asks you to close it. This also works for files on shared network drives, where a colleague might have the file open.
+- Fixed files with a wrong file extension being reported as empty. AI Studio now recognizes what a file really is by looking at its content, for example a PowerPoint presentation that was renamed to `.txt`, and reads it accordingly. It also points out the wrong extension so you can correct it.
+- Fixed files whose content is not text being sent as an empty document. AI Studio now tells you that the file is not readable as text, which usually means it carries a wrong file extension.
+- Fixed executable programs with a harmless file extension being read as text. They are now recognized by their content and refused.
+- Fixed a single unreadable page of a PDF silently cutting off the rest of the document. The remaining pages are now used, and AI Studio tells you which pages are missing.
+- Fixed a single unreadable sheet of a spreadsheet silently dropping all remaining sheets.
+- Fixed PDFs, text files, spreadsheets, and presentations requiring Pandoc. Only Word documents, OpenDocument text files, and HTML files need Pandoc, so every other file can now be attached and read without it.
+- Fixed attached files that are temporarily unavailable disappearing from your message without a word. This could happen when a file was stored on a network drive.
+- Fixed the file preview showing an empty document when reading the file failed. It now shows what went wrong, so the preview again answers what AI Studio will hand to the AI.
+- Fixed problems while reading files being missing from the log file after the first one. This made exactly those issues hard to track down that only appeared later on.
 - Fixed reset buttons in assistants. As you may have noticed in the Document Analysis Assistant, resetting it could leave content from the previous analysis visible. Reset buttons now clear previous results completely.
 - Fixed dropping files after you closed a dialog that accepts files itself. Such a dialog takes over dropped files while it is open, but never handed that role back when you closed it. Afterwards, the chat and the assistants silently ignored dropped files until you switched to another page. Each time you opened such a dialog again, the problem got worse.
 - Fixed configuration-managed settings remaining active after their configuration plugin was removed.
@@ -20,4 +33,5 @@
 - Fixed preview features contributed by several configuration plugins at once. Only the most recent contribution was recognized as coming from your organization, so features enabled by another configuration looked as if you had switched them on yourself. Each configuration is now tracked separately, which lets your organization enable one preview feature company-wide and another one for a single department.
 - Fixed which configuration wins when two configuration plugins collide, e.g. by claiming the same plugin ID, by managing the same setting, or by defining the same provider. Previously, this was down to chance, so a local configuration plugin could take over parts of the configuration your IT department deployed. Configurations from your organization now always win, and every ignored attempt is reported in the log.
 - Fixed the assistant categories when your organization hides individual assistants. A category heading could stay visible above an empty area, and the Log Viewer could disappear together with the Localization assistant. Each heading now follows the assistants actually shown below it.
+- Removed the legacy PowerPoint format (`.ppt`) from the selectable file types. AI Studio has no reader for it, so such a file could be attached but never read. The modern `.pptx` format is not affected.
 - Upgraded dependencies to their latest versions to improve security and stability.