Hi,
I have
- SP List A - where PowerApps will collect the data at first step.
- PowerApps Gallery - to display data of SP List A.
- SP List B - to take data (checkbox selected) from the PowerApps Gallery
So that's the process of my PowerApps. (Data 1 -> to number 2 -> Data selected in 2 submit to 3)

OnSelect for Presence button :
Patch('SEMINDA Student Attendance Checklist',ForAll(colAttendees As aPatch, {'Student Name': aPatch.'Display name', 'Class Name': aPatch.'Class Name'})); Navigate('Teacher Dashboard', CoverRight);
But the problem is once I clicked 'Presence' button, it did submit to the SP List B but with so many and duplicate data instead of the data I selected from the PowerApps Gallery.
Please help me. If there's something missing that is confusing you can ask me to share on it.
Thank you.