Upload files from browser when Ionic app is deployed as a web app

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This works for me:

PWA approach to uploading files

Do we have any options for browsing for files to upload - in a browser - without using a form? Can we use Transfer? If in a form, how does Transfer, which expects a string, handle the file passed from the input? error: cordova.js:381 Wrong type for parameter “filePath” of FileTransfer.upload: Expected String, but got File.