I amended the original template I received by adding my data and tabs. From what I can tell the GS reflects the version I need to replace in Glide.
However when I upload I get this despite same data/same column structure despite the columns and data being identical.
Interestingly the tabs in the warning are the tabs I added after my migration from the original account in which the template was bought. Which may point to permissions issues.
After an hour I got super frustrated and clicked the red button. Boom template gone.
Thankfully I’ve learnt to always keep a back up so I can copy features across item by item. Super frustrating time wasted as it appears the replace sheet feature is buggy.