gajim omemo received video. can view. download?

Lubuntu 18 gajim flatpak (by wiki) 1.1.3 omemo plugin 2.6.28

friend is using a fork of Conversations: Pix-Art Messenger

friend sends video in omemo conversation inline link is aes protocol -- so I cannot open in firefox click ubuntu spawns video player options pick gnome mpv or vlc video plays

there is no obvious UX in gajim or external player to download video

video not found in default gajim download location

what is the download or temp location for Gajim via flatpack?