In the Windows API, the maximum length for a path is MAX_PATH, which is defined as 260 characters. A local path is structured in the following order: drive letter, colon, backslash, name components separated by backslashes, and a terminating null character. For example, the maximum path on drive D is "D:\some 256-character path string<NUL>" where "<NUL>" represents the invisible terminating null character for the current system codepage. (The characters < > are used here for visual clarity and cannot be part of a valid path string.)
We are working quickly to find a solution. In the meantime users can go into a subfolder and upload the folder with long path by subfolders. For this, create a folder manually, then upload the subfolders, this will keep the path of uploaded files shorter.