Just wondering if people track their acceptance/rejects or simply track what you upload to each site. Personally I've been tracking acceptance/rejects but it is pretty time consuming so thinking about just tracking uploads.

Some do, I think Stockmarketer used to do the best of that, detailed tracking.

I stopped in about 2010, too much time. I was uploading, then accepted or rejected, by site, and then trying to see what sales were. I thought I could build on that knowledge but it's just to crazy. I mean, some images sell best pretty much everywhere. Others sell at one agency and not on others, with a different one being top at another place but not on the rest.

I don't even save monthly anymore as the agencies SS, AS and IS (with Deep Meta) have enough information, without me making some complicated and time consuming spreadsheet.

Oh for easy accepted rejected, I do that by folder on the computer. I have new, then after they are sent to "everywhere" they get moved to Uploaded 2022. If I feel the urge I'll just make a batch for WS now and then and hit all the agencies I don't have an account. If it's specific content that goes to Alamy and DT, then that does in the first instance, not to SS, IS or AS. If it's general, ALL five. But since editorial is different from graphics, vectors go to IS and AS.  They are under Vectors.

So whatever confusing mess that seems, what I'm saying is, I have New, then I have some sorting by file type or subjects and then I have a folder name Uploaded for each of those. I also have some under the general that might be Uploaded SS, if they are just hanging around for the future, or Uploaded AS, so I don't start re-uploading the same files to the same places.

Once I make a master file with the keywords and descriptions, that can be copied into the various agency folders. End of the year I can copy all of them to one 2022 Master Collection Microstock, where I only have one copy to archive, the dupes are gone.

i dont track rejects (i did it for videos but i dont submit videos anymore)
my workflow is similar to Pete's:

images go to an 'upload' folder

from there i ftp to most agencies except AS which go to an adobe folder

i need to further edit Adobe to take out editorial & what they might consider as similars

i move a few images to folders for FAA & pixify

finally i move all images to an archive folder (which gets backed up to an ex HD and backblaze)

I track everything with an Excel spreadsheet, that has each image name, titles/keywords etc., when it was sent to each agency, when they replied and the outcome.  It takes some time but not too bad once set up.  Each batch of uploads goes in its own folder labeled by the day so I can easily go back to them if needed.  For example, when Adobe started taking PNGs, I could easily go through each upload folder to find which contained PNGs, then from the image names back to the spreadsheet to retrieve the description and keywords, going all the way back to 2009.  I have another spreadsheet to keep track of earnings.  Used to track lots of other things but decided it wasn't worth the time.

what's your portfolio size? with thousands of images it would seem to take a lot of time tracking each agency - worth the time at $.10 per image or low sales volumes?

I don't think it's that useful, unless the website limits your uploads if you get rejected too often.
I believe Dreamtimes does that and they give you the percentage of the files that were approved.