wrong path to the file in the back-end
This problem happens only when site is located in the subfolder. When we try to access uploaded file from the back-end edit-entry view, path to the file is generated to the root domain folder, subfolder in the path is missed. For example if file is saved in location:
https://domain.name.eu/subfolder/images/sobipro/upload/55/some_name.pdf
in the back-end generated is following path:
https://domain.name.eu/images/sobipro/upload/55/some_name.pdf
at teh front-end file can be accessed without problems.