Today's Signal release for Android, iOS, and Desktop includes the ability to send arbitrary file types.pic.twitter.com/LfRkGxFvZc
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Hopefully someday you get the negotiating leverage!
Also the same problem with default browser, can't change to @brave note that windows seems to be moving in this direction also
It's entirely possible to integrate IOS share sheets, though (share button) That would greatly improve usability.
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