"Is there an actual list of the criteria needed so you don't keep submitting to have them rejected a few days later with zero feedback from those who evaluate your work."
I guess the following list is a good start to get an idea of why pictures might be rejected:
Reasons content is rejected at Adobe Stock
But I know that sometimes it's hard to understand why a picture was not accepted, especially when 'technical problem' is the given reason. I've had my share of rejected pictures and while in some cases, after paying extra attention to details, it becomes obvious why it wasn't accepted, sometimes I'm just left scratching my head as well...
Michael
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Michael Niessen - Photographer, photo-editor, educator
Photo-editing (Ps/Lr/LrC) and photography workshops & one-on-one training (off- and online)