don't use directory tree in destination

I want copy files from source to destinations but no like directory trees on source. I want copy them on one folder:

Source:

e:\media\clip\clip-morning1.mp4 
e:\media\clip\clip-morning2.mp4
e:\media\video\film1.mp4
e:\media\video\film2.mp4
e:\media\podcastA\episode1.mp4

Destination:

clip-morning1.mp4
clip-morning2.mp4
film1.mp4
film2.mp4
episode1.mp4

This is possible in Syncthing?

Only if you hardlink every file you want to sync into a directory which you then sync. You should also set the folder to Send-Only, as changes synced bask to the source would only replace the file inside the synced directory and not the original.

While not a clean method, but you can achieve this by adding all the folders under the same path at the destination while also setting them to “Receive Only”. Remember not to press the “Revert Local Addition” buttons which will always be present.

They are lot of folders, Do you have any simple solution?

Not really, unless you write some automation scripts that would either utilise syncthing cli, the REST API or add the folders to config.xml en masse.