How to disable image thumbnails from media manager but not post media uploader?

by

Not sure if I’ve understand this correctly but you should be able to check which tab is currently open by looking at $_GET['tab']

  • upload new tab = type
  • from url = type_url
  • gallery = gallery
  • media library = library

So you could wrap your code inside 

if ( $_GET['tab'] != 'type' )  // do stuff