Usually, uploading your own logo to Google Workspace is pretty straight forward process, and I have had any issues, but just in case if you do not see your logo, please consider following-:
1. Ensure you have followed Google’s recommendation on logo size and format explained above.
2. You should see your logo under “Custom Logo” in Google Workspace admin console, once you upload it, if you don’t see it here after uploading, then there is something wrong, you may try clearing your cache and cookies.
3. If you see your logo under custom logo radio button, but not in the end user applications (e.g Gmail, Google Drive etc), then allow it sometime to reflect.
Google says that it might take up to 4 days for your newly uploaded custom logo to appear in Google Workspace applications.
Also, make sure your logo does not include Google, Gmail or any Google property logo, Illegal or copyrighted images are also prohibited by Google.