I think there is no feature. But you can combine the app Forms with an upload share e.g. File Drop.
Text in the free form text field including markdown-html-link to the share:
Please fill out the formular.
You can upload the files here: [link to the upload share](https://cloud.server.tld/s/abcdefghijklmno)
screenshot example:
Since you probably can’t assign the files to a person, you might have to create a separate form and share for each person. But it is easy to copy forms. Or you have to ask your users to name the upload files correctly. Then maybe you can use a direct upload share in your Wordpress without forms.
Since you are a musician it might be worth adding a dedicated tool, such as magic wormhole or syncthing. Issue I run into with the file upload is it has no conflict management or resume option for when things fail… you might miss the logic of the desktop client; you might miss the occasional file. Especially when someone is sending you lots of small files.
I find the file upload is great for “send me your photos at a party” but bad for “upload these critical work docs in the next 5 minutes”.