I am just starting out with PowerApps (i.e., about 2 weeks) and am trying to do a proof of concept where I can select a single value from a list and multiple values from a list, gallery, combobox, etc. and save multiple records (i.e., not concatenate) to the dataverse table. I have started looking at PowerApps 911 tutorials and have started understanding the collection and patch features. So far I am able to patch a single selection from both controls but not a single selection from one and multiple from the other as intended.
This YouTube video captures what I am trying to do, but I have not figured out where he is starting from in order to execute what he is demonstrating: PowerApps use Collect to submit multiple rows of data to your data source - YouTube
Thanks for any help you can provide on getting me started!