this video shows how to solve this message without using computer.
IF YOU DIDN'T UNDERSTAND ON VIDEO THEN FOLLOW THIS STEPS:-
1• Open YT studio
2• Click edit mark on video
3• Click custom thumbnail
4• Click learn more
5• Click "account is verified"
6• Click browser you prefer to use
7• Sign in your Gmail account
8• Add phone number to get verification code then submit
9• After verification on the same tab click Youtube logo on the left
10• Go to library
11• Open your videos
12• Click three dot on the video you want to put thumbnail
13• Click on "edit advanced setting on YT studio"
14• Click edit mark on video
15•Click custom thumbnail
16•Choose photo you want to use as thumbnail
17•Save
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