Why can I sync on my PC? Not on Android phones

Support
1

I installed the program on my PC and synchronized it in WebDAV mode. Everything is perfect.But definitely not working on Android. The app gives me “Network request failed” message. I tried all kinds of ways. It still nothing works.The version is the lastest.
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Where did I set it up wrong? How can we solve this problem?

2

Plain http is not supported on Android, and non-standard ports may be a problem too.

3

Thank you. When I changed it to HTTPS, it works.