Send a PDF in Firebase Storage

Hello, I am looking for one of my professional projects, to send PDFs online on the FIREBASE storage and upstream, to be able to select them as in a file manager (as one could select photos in MIT APP INVENTOR).
NB: I am looking to be able to select them, because the names of PDFs are likely to change and they are the ones I receive by email, so I am not the one who names them.

Do you have a solution?

Thank you in advance

Use this extension - That page doesn’t exist -

Extension is here:

Hello, I already have this extension, but it can only send a file by name and as previously said it is not going and in addition how to have a file selector?

do you have solutions ?

no, but let me try