The Filestack modal uses an html input tag for selecting local files eg.
When you set the mimetype or extension parameter in your picker options, it adds an 'accept attribute' to the tag. For example, for the
application/octet-stream mimetype it adds:
<input type="file" accept='application/octet-stream'> to the tag.
However, the mimetype can vary depending on what browser or operating system you are using. For example, PSD files have the mimetype
application/x-photoshop in Firefox, but show up as
image/vnd.adobe.photoshop in Chrome.
The best way to deal with this is to include both mimetypes in your
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