Keep syncing after imported collection contains more than 1000 requests


I tried to import large collection (more than 1000 requests) via json file, although it’s succeed on my local Postman app, it keep syncing and never stop, sometime it even becomes offline and I need to reconnect again.

I also check my Workspace page, and the imported collection cannot be found there but only my local machine, and if I try to publish doc for this collection, I will get 403 error:

You do not have permission to perform this action. You must have edit access in order to publish a collection.

Could anyone help?