Sorry to say but this is a known issue and there is no suitable workaround. Microsoft have to fix their apps 
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More details about that: Opening files in microsoft apps still just read only in 1.4.0
Other apps should work but I know it’s a huge issue that the MS apps aren’t directly editable but as I said, there is no workaround 
Edit: Well just recognized you aren’t using the MS apps, hmm okay than they have maybe a similar problem, will figure that out, thanks for reporting 