Having the same issue when I am using the webclient through reverse proxy (getting to local Zimbra server with outside address).
When I reach the webclient directly (ie. bypassing reverse proxy, ie using local address) then files can be attached to the mail message.
BTW: using Release 8.8.15.GA.3869.UBUNTU18.64 UBUNTU18_64 FOSS edition, Patch 8.8.15_P9, with FF 76.0.1 (64-bits)
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