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Should the thumbnail field in a frontend form allow any file type to be uploaded?
I think the thumbnail field is a file upload field type, currently. I'm able to upload a PDF as a thumbnail. Seems like it should be an image upload field type so that it only allows uploading of image file types.
If it is intended to be a file upload field type (allow any type of file to be uploaded), then how can I restrict it to certain file types?
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