Editing with companion app leaves garbled comment on attachment when multibyte language is used

Summary

Garbled comment is added when an attachment is edited with companion app in an environment of multibyte language as Japanese or Chinese.

Environment

• Companion application for both Windows/Mac
• Multibyte language like Japanese or Chinese is set for the profile on Confluence

Steps to Reproduce

1. Set the language to multibyte language as Japanese or Chinese
2. Upload an office file
3. Preview the file and edit with companion app
   
4. Save it and upload
5. 
6. Then go to the attachment screen on the page in Confluence

Expected Results

Right expression that means "Uploaded from Companion app" should be added in comment.

Actual Results

The comment is garbled.

Note

• At least, this garbled character was confirmed when attachment is edited with Japanese and Chinese.

Workaround

Change the profile language to English.