Hi @Anthony Yau,
Good day! Thank you for posting your concern in this Community.
Per the description shared, I understand your concern but it's related to SharePoint IOS App.
In fact, we are currently providing help on problems with SharePoint Web Side, and we lacked information and test environments for the SharePoint IOS application. Since we are not very proficient, given the complexity of your problem, we would recommend that you go to SharePoint iOS Community for more professional help, there will be very professional people to solve the problem for you quickly.
Thank you for your kind understanding.
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