@Canadiansal
You can to this using Patch function. Set OnSelect property of button to:
Patch(SharePointListSource, ThisItem, {Week#: ThisItem.Week# + 1})
Use internal name of Week# column in formula.
If you are not using any gallery and want to update list item using it's ID then use:
Patch(SharePointListSource, {ID: 2}, { Week#: LookUp(SharePointListSource, ThisRecord.ID = 2, Week#) + 1 })
Here 2 is ID of SharePoint list item.
Check below references for more information:
- Increment a SharePoint number column by 1 on button click
- Patch function in Power Apps
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