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 @redi I played around with it a bit and it seems that on 1:1 chats the paperclip sometimes disappears for unclear reasons. closing the 1:1 chat via the top right X and reopening it works on my setup to show the paperclip again. 
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 Great. Now upload works now. Thank you very much. 
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 some further investigations about the double messages: 
 (1) If I send multiple messages to one person quit fast after each other, the I get only one omemo warning.
 (2) Although warning and message have the same time, they do not arrive at the same time.
 When I send the message the warning is displayed later although the same time as for the message is shown.Could it be that the warning is caused by a read confirmation or something similar ? redi 
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 @redi sorry, but I really can't help you with that. You might want to raise an issue on the upstream conversejs repository: 
 https://github.com/conversejs/converse.js/
 Please mention that you are using ConverseJS 6.0.1 with my Ubuntu Touch wrapper.It might very well be a known issue given the complexities around OMEMO. I know that just recently a draft for the revision of the official OMEMO standard was submitted that among some other bigger problems tried to solve various multi-client edge cases. But to be honest, I would not expect it to be fixed any time soon  
