We suspect that this issue may arise if the migration schedule has not been run post-upgrade.
To troubleshoot this issue further, we kindly request the output of the following query.
select * from globalconfig where category = 'InlineImageMigrationToCorrectLocation_SCP';
Kindly copy the output of the query to a notepad and send it to us for further analysis.
Additionally, we kindly request you to share the complete upgrade logs to facilitate a more thorough investigation.
You can conveniently upload the zipped log folder by following this link. Click log analysis and mention the ticket number while uploading the logs.
The logs folder is located under the following path:
<Drive:>/ManageEngine/SupportCenterPlus/logs