@danbp I mean’t the front-end upload. But I’ve found the issue. In the custom theme I bought is another Buddypress folder which overrides (I guess) the plugin, because when I remove the folder from the theme, I get a seperate menu item which links to uploading a new avatar.
The custom theme is Blackfyre by Skywarrior, did anybody else had this issue or knows the solution? Maybe like which function I need to include in the custom BuddyPress?