Hi @er_ankit_singh,
In order to upload a workflow to Alteryx Gallery or a collection on the Alteryx Gallery, you must connect within Designer first by going to File --> Save As --> Alteryx Server --> Add new server and paste in the Gallery URL.
Once you add the connection, you can click File --> Save As --> Alteryx Server --> Gallery connection to save to Gallery/My Workspace/ Studio.
From here you can add the workflow/file to collections.
Hope this helps. If it does, please like this post and mark it as a solution. Please let us know if you have any questions.
