Adding New Feature Templates into Feature Definition Schema?

[ShelbyZemken1]

I'm trying to add 5 new feature templates to a list of existing feature templates on a hosted feature layer in ArcGIS Online. I found documentation describing How to Update Your Hosted Feature Service Schemas in ArcGIS Online, but I've had no luck having the additions accepted into the schema. 

I have successfully validated my additions using JSONLINT, so it's not a syntax issue. When updating the definition I receive no errors, and the feature layer even says 'updated' after I submit them. The problem is that the added feature templates don't show up in the definition. 

Has anyone else successfully updated feature templates in ArcGIS Online using the update definition route? Is there another way?

[ShelbyZemken1 · Accepted solution]

Strangely enough, adding in my templates one at a time solved this issue. I guess you want update multiple templates in one fell swoop. Only one at a time.