Add attachments to gmail via Directory Opus, not File Explorer

I would like to add attachments to gmail by selecting from files on my hard drive via Directory Opus. Currently every time I click the icon in gmail for attachments, File Explorer comes up. It often freezes for a long time upon being summoned up in this way. So I would like to bypass File Explorer entirely in this situation.

What are the settings to change for this purpose?

Thank you!!

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