Those that have tested at 23andMe on the new chip(starting Aug of 2017) cannot upload to the main GEDmatch database but can upload to the GEDmatch Genesis section(currently in beta). I had updated the "Download from Test Site & Upload to GEDmatch" post to show changes but I think the information on the GENESIS upload may be buried in that post. That said, I thought I'd post this specifically for those who tested at 23andMe and received their results after July 2017.
Downloading your file from 23andMe
To download your Raw Data from 23andMe log on to your account if you have multiple kits associated with your acct make sure you have selected the proper test. Select the Tool option and then click on Download. You should see a page similar to the one below.
This page contains information about the raw data file. Scroll down and select the "Submit Request" button. Follow directions on that page for obtaining the file.
Uploading the file to the GENESIS section of GEDmatch
You will need to register if you don't already have a GEDmatch account.
Register for GEDmatch
Once registered return to Genesis page
Log on and select Generic Uploads as shown below in the highlighted section of the screen capture.
Follow the directions on that page and make sure you wait for the file to upload. Once it uploads you should see a notice and the kit number. These upload instructions will also work for any of your other DNA results from AncestryDNA, FTDNA, earlier 23andMe, or MyHeritage files that you have downloaded and wish to upload to Genesis.