GPT on iOS not loading file but ChatGPT is

File size is 10~mb and the upload and parsing works fine in the GPT in a mobile browser but consistently fails in this GPT on IOS.
I tried uploading the file on IOS ChatGPT directly and it works too. But on the GPT it fails. Sometimes it ignores the upload other times it crashes the app.
Appears to be specific to GPTs and file upload on IOS.

On browser it works as expected