Please consider updating the Default Accepted Media Types for file uploads.
Users get really turned off when they try to share a simple Excel document and get rejected.
This is the default value:
'image/*,audio/*,video/*,application/zip,application/x-rar-compressed,application/pdf,text/plain,application/msword,application/vnd.openxmlformats-officedocument.wordprocessingml.document'
This is the value from open.rocket.chat:
*.sketch,image/*,audio/*,video/*,application/zip,application/gzip,application/x-gzip,application/x-rar-compressed,application/pdf,text/plain,text/markdown,application/msword,application/vnd.openxmlformats-officedocument.wordprocessingml.document,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet,application/vnd.ms-excel,text/csv,application/vnd.android.package-archive
Which allows for Excel files and more.
What else should be added to the list and made default?
http://checkfiletype.com/ may be a good place to look.
[ thanks to @bradley.hilton for helping track this down ]