webuploader filetype filter

When using the webuploader, the user is free to select photo’s and movies.
Is it possible to filter the filetype so that only pictures can be chosen and uploaded by the user?
(It’s possible to simply ignore chosen movies, but it would be nice if we could set a filter)
Does anyone have a solution or workaround?

Second Webuploader question: I noticed an earlier post (May this year) stating that Android browsers do not always support multiple file selection.
Did anyone find a workaround for that?

[quote=402759:@Boudewijn Krijger]When using the webuploader, the user is free to select photo’s and movies.
Is it possible to filter the filetype so that only pictures can be chosen and uploaded by the user?
(It’s possible to simply ignore chosen movies, but it would be nice if we could set a filter)
Does anyone have a solution or workaround?[/quote]
This capability was added in 2018r1.