i can't update screenshots using import videos

[steven]

i tried many times to update my videos thumbs using import method but i have this error
 

• [Field 3]: this field is not supported in update mode

isn't it available to import videos from links because i tried many times there is no problem with the photos
if not then what is the solution i need to update 6K videos from links !
i can't never do this manually, especially that updating need me open each video edit page and open screenshots and then upload !!

[Tech Support]

Unfortunately not technical possible in KVS to mass update screenshots via import.