hopefully fix #4640  -- drag and drop upload of anything in cocalc-docker is broken
hopefully fix #4640  -- drag and drop upload of anything in cocalc-docker is broken

sagemathinc/smc,tscholl2/smc,tscholl2/smc,sagemathinc/smc,tscholl2/smc,sagemathinc/smc,tscholl2/smc,sagemathinc/smc,tscholl2/smc