I can sync with MirrorSync 6.03, but I can't download the fileset.

The environment is as follows.
Server OS: mac OS 10.13.6 High Sierra
Server Machine: mac mini
Memory: 16GB
FileMaker Server: 18.0.3.319
Custom Apps: MCSApp, MCSData, timestamppicker16mcs,
These are separation models. timestamppicker16mcs is for reference only. There is no need for synchronization.

 

MCSApp has layouts, scripts and relations.
MCSData is data-centric, but has a lookup relation.
Each file relationship is different from the primary key.
The primary key is UUID and was created for MirrorSync.
Therefore, only documents and items have a primary key used for relations. The other tables are masters. The relation key is individual.
In MCSApp, each master is associated with a separate key.

All tables can be synchronized with MirrorSync, but the three files are not downloaded. Only MCSApp will be downloaded. I want to know why this is and how I can download three files.

I have another question. When I update a new version of a file from my iPad, the process never ends. It doesn't end in 2 days.
What is the cause?

Thank you.

By the way, the number of records is about 16000 at most.