Problem
AE-2322: UI gets blocked during Import & Export Logs operations when processing large file sizes

AE-2323: Snapshot import from remote machine fails late due to missing permission validation on snapshot repository path
Solution
As of now the export and import processes were running as seperate process but it was returning value which was blocking. Have made changes for it to run as background process and return status as Started. The status for import and export can be fetched through the status API /snapshot/export/status , /snapshot/import/status
When we copy the snapshot from remote machine it is possible that it gets copied with the permissions from the remote machine. Because of this there will be permission issue.

Changing the permission of the snapshot dir again after the rsync or scp

Tested on my AMP with the logs imported from Arjun's setup