Please add sync options in ~/.config/inkdrop/config.cson like so:
"*":
core:
db:
sync:
options:
push:
batch_size: 2
batches_limit: 2
pull:
batch_size: 20
batches_limit: 2
And launch the app.
It will send only 2 documents per request so the connection should not hang due to timeout.
Since you have many notes and images, it will take for a while until the sync finishes.
I’ll check the server log tomorrow morning if the same error happens.
Thank you for your cooperation!