Shouldn't the rwmb_media_add_string have a parameter that identifies which setting is being used? We have a situation where we have one media upload button that needs to say "Upload Logo" while another needs to say "Upload Other Thing". But I can't seen an obvious way to distinguish which setting the filter is being called on...
Currently, there is no setting parameter to change the upload button text for a specific field. It just applies to all media fields. I'm going to inform the developer team to consider adding it to the to-do list for the future development of the plugin.
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