(i) you automatically grant to us and our sub-licensees (and warrant that the licensor of such rights has expressly granted to us and our sub-licensees) the worldwide, perpetual, royalty-free, fully paid-up, irrevocable, non-exclusive, sublicensable (through multiple tiers) right and license to have Access to, store, display, reproduce, use, disclose, transmit, view, reproduce, modify, adapt, translate, publish, broadcast, perform and display (whether publicly or otherwise), distribute, re-distribute, transmit, save and use Your Content (in whole or in part) for any reason and/or purpose (whether commercial or non-commercial) by any and all means in any and all media, forms, formats, platforms and technologies now known or hereafter devised, invented, developed or improved in connection with the Service, Autodesk Materials or our business generally.
That quote is a part of a bigger statement
"(b) Sharing Your Content. The Service may permit or require you to share Your Content to one or more public area(s) designated for that purpose, including on our web site(s). If that is the case, by uploading, posting, publishing, transmitting, displaying, distributing, emailing, saving, sharing or otherwise transmitting or making available Your Content to a public area of the Service or through the Service to another public location:
(i) you automatically grant to us and our sub-licensees (and warrant that the licensor of such rights has expressly granted to us and our sub-licensees) the worldwide, perpetual, royalty-free, fully paid-up, irrevocable, non-exclusive" and so on.
If I am not wrong that part (i) goes after "If that's the case" of sharing your content. Which you could not share I believe.
Later in paragraph (c) in case you don't want to share things
" (c) Keeping Your Content Non-public. The Service may also permit you to choose not to post or publish onto public area(s) designated for sharing (e.g., Your Content published into a private area on our web site(s) or, to the extent allowed by the Service, emailed to or Accessed by solely your authorized designees, or Your Content using our Software without posting or publishing onto a public area of the Service. In these situations, (i) we will not authorize Your Content to be shared with others publicly [although we cannot promise complete data security (e.g., of cloud servers)]: (ii) you automatically grant to us and our sub-licensees (and warrant that the licensor of such rights has expressly granted to us and our sub-licensees) a perpetual, irrevocable, non-exclusive, royalty-free, paid-up, worldwide, sublicensable (through multiple tiers) license to have Access to, store, display, reproduce, modify, use, disclose, distribute and transmit such Your Content for purposes of providing, maintaining, repairing, protecting, organizing and/or otherwise administering or providing to you products, services and/or features on the Service (e.g., allowing Your Content to be emailed to or Accessed by your authorized designees),to comply with applicable laws/regulations/legal proceedings, in the ordinary course of our (or our designated third parties’) providing, improving and/or modifying the Service or any of products and/or services, including extracting, compiling, aggregating, synthesizing, using, and otherwise analyzing all or any portion of Your Content and information, and to disclose such Content and information and the results of any such analysis in aggregated form or any other form that does not specifically identify you unless emailed to or Accessed by your authorized designees or otherwise permitted by these Terms. "
Still a bit confusing but looks like they claim some rights only "for purposes of providing, maintaining, repairing etc"
Although from my personal experience if any contract have something unclear it is always against you. They definitely might write it more straight.
