Could not share files

Hello, I use my GL-AR750 to share files. The router has the actual firmware. The Problem is that I could only open the files from the connected USB stick if I use my macBook. If I try to read the files with my iPhone, I could see all files, but I could not open any file. The same problem I have with my iPad. Do you have any idea s
to solve the problem?

The 3.x firmware uses samba1 for file sharing, which is too old to be compatible with iOS. Due to size issues, samba4 cannot be installed on the AR750S. After all, it is only 16M.
If you are familiar with openwrt or linux, you can try installing the webdav service yourself.