I am trying to create a Collector App within Portal 10.8.1. I can't have a hosted feature layer or map service that uses my hosted server as my ArcGIS Server is internal and the VIP does not have outside internet access on it.
When I tried uploading my FGDB to Portal and having it be a Hosted Feature Layer it automatically created a service within ArcGIS Server.
Is there a way to add a zipped FGDB into Portal with edit features without a service being created within my hosted server?
Oh. No. you can't edit the zipped FGDB following the procedure I outlined. In mobile apps, the data writer must do so to a "pass through" EGDB with correct permission settings or a hosted feature layer (aka EGDB hosting in ArcGIS Data store.
All published layers (hosted or map services) live within the Hosting Server. The layer being "Hosted" only means that it's self contained with the Enterprise system as a whole. Portal is the front-end component of Enterprise and has no data storing capabilities by itself, like you are asking about.
What you need is local editing without a service.
I don't know if it's possible with Collector.
There is mobile map package:
I'm not sure it will work with Collector.
You can publish your content to ArcGIS Online and use the Collector with it.