I noticed an annoying thing when uploading photos taken with my Sony cameras (either A7Rii or A6500).  Caption metadata that has been added to the jpeg is lost.  This does not happen when I upload files from other camera brands (Panasonic or Canon).   Similarly, when I upload Sony files to any of several other stock agencies, they get the caption data.

If I use DeepMeta, Istock gets the caption even from Sony cameras.  However, I find that a pain to use.

Has anybody else noticed this, and found a workaround?

Generally, I find uploading to Istock to be more time consuming and bothersome than other sites.  As a result, I upload to them more sparingly, focussing on files that I think might sell better there.