On Note 10 Lite I am trying to export a copy of a frame from the motion picture mode. I press save copy and phone says 'trouble exporting image'  and won't export. Any thoughts please

Hi, when i first got my Note 10 lite I had a function which allowed me to choose the frame I wanted after i had taken a shot.  The frames still appear on older photos I took but I can't actually select the frame I want. On more recent photos the fram...