I have some custom code I use for that right now, just wasn't sure how it would work with your plugin.
The upload script we're using now has a callback for a custom upload folder, which your plugin also has, and a callback for a custom file name, which the Meta Box plugin doesn't have. We upload several types of files, and they're named differently depending on the document type.
$unit_inspection_documentation_upload_overrides = array( 'test_form' => false, 'unique_filename_callback' => 'unit_inspection_documentation_filename' );
$unit_inspection_documentation_uploaded_file = wp_handle_upload($_FILES['unit_inspection_documentation_attachment'], $unit_inspection_documentation_upload_overrides);
So in our current code it calls a "unique_filename_callback" function to get the name of the file before passing it to wp_handle_upload. That function names the file based on values from the database. That all works as expected.
However, I've been migrating our custom post metaboxes over to your plugin, and these uploads are the only part I can't figure out.
It's not a huge problem, because if I can't figure it out I'll just use a second custom metabox with our own code for the file uploads, and use Meta Box for the rest. Was just hoping to combine them into one tabbed Meta Box.
Right now I'm not sure how to integrate a custom filename function
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