Issues with downloading and uploading back annotated pdf files from onedrive. sync is not happening

Hi Adobe Reader,

I do have Issues with downloading and uploading back annotated pdf files from onedrive. sync is not happening manually or automatically. it takes long time open the pdf file of even 70mb size. Im using the app on Ipad 6th generation. let me know if it can be fixable or not?

Thank you.

Regards,
Dr.Swaminathan.