In order to make structure more clear in the /content/dam, and to avoid that assets are uploaded on all locations without maintaining this folder structure, is there a possibility to block the upload of assets on level 1, level 2... and to only allow folders on these levels?
Just trying to understand the question. Cant we just assign read access to the authorized user group and then provide edit access to another subgroup for level 1 or 2 whichever is business requirement.
If its a manual upload, in your scenario you will have to override the OOTB capability by checking hiding the file upload option in case the path is under L1/L2 .
The below link will give you a clear picture of the libs files involved in the create dropwdown
Just trying to understand the question. Cant we just assign read access to the authorized user group and then provide edit access to another subgroup for level 1 or 2 whichever is business requirement.