Intermittent issue: unable to select multiple features to append/replace

[rebeccawilliamss]

I am unable to select multiple features from different layers to append/replace a registered feature at the same time. I was able to do this when testing first began but for some reason I am now unable to.

Question: By selecting one feature from a record to append/replace, does this select all features from that record?

Steps to reproduce

1. Establish an Arches Connection in Arc Pro using the given credentials

2. Select a feature to register to Arches and edit

3. Select multiple geometries to append

4. Upload the selected geometries, you get an error message: 'Exception: Object reference not set to an instance of an object'. This would suggest nothing has been selected, or what has been selected does not have a value.

In the example below, the polygon circled blue is the registered feature, and the geometries circled red (2 polygons and some points) are the features that have been selected to append:

15/10/2020: I registered a Line feature, and selected multiple features to append, shown in the screenshot below. However, I received the same error message: