The mobile client crash due to the file name in the channel

[Yosh11]

Summary

The application crashes with the error 'Unexpected error occurred' when there is a file with a name like '*%.xlsx'.

Environment Information

• Device Name: iPhone 14 Pro
• OS Version: ios 17.6.1
• Mattermost App Version: 2.22.0 (Build 574)
• Mattermost Server Version: 9.11.3 (Build 11258453163

Steps to reproduce

A file with a name like '*%.xlsx' is attached to the message, after which the application on the iPhone crashes when trying to access this channel with this file. No errors are observed in the desktop application; however, such a file is absent in the 'View info > Files' tab. The indexing may be breaking.

Expected behavior

No error when entering the channel from the iPhone.

Possible fixes

If the file is removed from the channel, the problem disappears, and the same error also goes away if the same file is sent but with the '%' sign removed before the period.

Observed behavior (that appears unintentional)

[enahum]

@larkox can you link your PR to close this issue?

[oleynikd]

Confirmed: This issue occurs specifically when uploading PDF files with "%" characters in the filename.

Steps to reproduce:

1. Upload a PDF file containing "%" in filename (example file attached) from desktop app
2. Open this channel on Android or iOS app
3. Observe the error

Additional testing notes:

• Consistently reproducible with PDF, XLSX, CSV files
• No problems observed when uploading image files with "%" in filename

Mattermost_logo_%_vertical_black.pdf

[simevo]

same here!