I want to use the File Upload widget, but the Multiple Files checkbox for
Enable Multi-File Upload
is greyed out
If you accepted file uploads when the field was configured for single uploads, you will not be able to enable multiple uploads.
You can mark that field NOT required and then admin only visibility, then add a new field configured for multi-file upload, right next to it in the form builder. The old entries will still contain the files that were collected with the single file upload field, and new entries will use the multi-file upload field.
Don’t delete the single file upload field as that will delete any data or files that were collected when that field was in the form.
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