Here's how I got accomplished this after I could not get @v-xida-msft 's method to work.
Patch(SharepointList, LookUp(SharepointList, eventId = varEventId), frmMainForm.Updates, frmAttachments.Updates
Hope this helps!
The LookUp function is used to identify a single record in a DataSource. Since I want to add attachments to only a single record, I use LookUp. In some cases, you could also use First(Filter()) to perform the same.
You need to put whatever text fields/dropdowns/dates etc inside of the patch OBJECT section... then (because Patch() allows for extra parameters) you add another parameter to patch... called Form1.Updates. So that will patch all records you created (your custom form) AND it will grab the "update" info from your form, (where the only field is Attachments) and will include all of that in 1 single patch.
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