Sync Between Two of My Devices Does not Work in One Direction

Short Description

The sync between my Android device and my home server does not work, when I add files on my Android device. The other way around works. Why do this situation occur, what can I do to further debug this problem and how do I fix this, so that the sync works?

Details

I had problems syncing my Android device with my NAS, so I made a little lab setup to debug the Problems

Setup

I have 3 devices

  • NSYNC
    • VM on Home Server
    • Located in subnet A
    • nixos 24.05
    • syncthing v1.27.7
  • Laptop
    • Laptop
    • Located in subnet B
    • Fedora 40
    • syncthing v1.27.7
  • Pixel6
    • Phone
    • Located in subent B
    • Android 14
    • Syncthing v1.27.6

All devices are paired with another through syncthing. Nsync is paired using the IP-address (tcp://x.x.x.x:2200) on the other devices. Everything else is on dynamic. Global discovery and relaying are turned off.

There are 4 folders

  • nsync-laptop
    • synced between NSYNC and Laptop
  • nsync-pixel6
    • synced between NSYNC and Pixel6
  • nsync-laptop
    • synced between Laptop and Pixel6
  • nsync-laptop-pixel6
    • synced between all 3 devices

Observations

  • nsync-laptop, nsync-laptopand nsync-laptop-pixel6 snyc well
    • both directions
    • fast discovery of changes
    • fast transmission of changes
  • nsync-pixel6 syncs well if a file is added on NSYNC
  • nsync-pixel6 does not sync at all if a file is added on Pixel6
    • This is the Problem
    • Pixel6 shows
      • Idle on the folder
      • Syncing (95%) on NSYNC
    • NSYNC shows
      • Syncing (90%, 5.97 MiB) on the folder
      • Up to Date on Pixel6
  • The situation remains the same, even after every syncthing daemon involved is restarted.

NSYNC’s view

Pixel6’s view

Could you post another screenshot from the nsync device , but with the nsync-pixel6 folder panel open so that the details are visible?

On the Pixel 6, a screenshot from the web UI would also be helpful.

sure:

nsync’s view

pixel6’s view

Device

Folder

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