Outlook App Attachment From Onedrive App

Hi. I use Outlook App with my Microsoft e-mail account. Also have Onedrive app with two different accounts. One for my work/job and the other one is for personal use.

Problem #1: In personal iPhone (XS), when composing new e-mail message within Outlook app, when I select to attach a file, it opens the available locations for selection of the file. It show local (on my iphone), my personal OneDrive and my company's one drive. When selecting a file from either OneDrive location, it simple doesn't attach. Clicking on the file does nothing. As if the file wasn't available for attachment.

Problem #2: On my company/work iPhone (15), after selecting to attach a file, the available locations shows both OneDrive account. But, in another iphone, doing the same procedure, shows only one OneDrive option. I have two OneDrive accounts setup on that iphone, just like the iphone from Problem #1. The two accounts are setup ok in the OneDrive app. For me to select the second OneDrive account, I have to click on "More/Other Locations" so I am able to select the "hidden" OneDrive account. That iPhone hasn't any kind of control.

Question for problem #1: Why that problem occurs? Is it some kind of bug with the Outlook app and iOS? All the app and iOS are in the latest version. Just for testing, I tried to attach a file from the Outlook app in an Android system. Worked fine.

Question for problem #2: How to make the two OneDrive accounts show when selecting an attachment?

If needed, I can provide with some screenshots.

Thank you.