Yes, I am sorry for not explaining more from the beginning. Thanks for your help.
Information on the Deployment: Self-Hosted, versions of the server see image:
On my iPhone: iOS 14.6, RocketChat App Version 4.17.24353.
The issue is, as explained above: When I share a picture or video by taking it from the Rocket.Chat App on my iPhone (by clicking on the + sign in a chat room, on the lower left), the media file (picture/video) gets compressed. That is what I want to keep bandwidth usage low.
On the other hand, when I share a media file (picture/video) from the iPhone Photos Galery App, by sharing it with the Rocket.Chat App, the media file does not get compressed. One single picture can easily comprise around 4mb - 5mb. Does anybody have a similar issue? Is the Rocket.Chat App on iOS capable of compressing media that is shared with the App (resp. trough the App) or do I have to enable this setting somewhere?
Thanks in advance!