Need a way to download a file, and then reupload it with user local modification

i currently write a blazor app where i have to download a file from my server (excel/word files), let the user update them and send it back to the server.

and it seem pain in the ass with web technology.

Let the user upload manually the file is not an option (risk of selecting the wrong file and its not ergonomic).

Im wondering if there is a way to keep a "link" when the file is downloaded, so in my interface i can put a button "reupload it" which will take the file locally and send it to the server.

surprisely with the new file system api i don't seed anything like that (im focus on chrome so i can use this kind of modern api)

I am looking for javascript solution by the way.

thanks for your help