Cannot Save File Type as "Adobe PDF" in Photoshop 26.0.0

That's a bad choice of words in the documentation, but the confusion comes in because all PDFs are "Adobe PDF," but Photoshop's default is to offer to save a "Photoshop PDF." Here's how to decode that.

When you choose to save as a "Photoshop PDF" you will get the dialog that Conrad shows in his reply. Notice the checkbox that says "Preserve Photoshop Editing Capabilities." If that is checked, then the PDF you save will include the entire Photoshop file, making it quite large but able to be opened and edited in Photoshop later. That's a "Photoshop PDF." It's still a PDF; it just has a bunch of extra baggage. (Some PDF presets are predefined international standards for professional printing, such as PDF/X-1a, and those automatically exclude the Photoshop data.)

If you uncheck that box, you'll still be saving a PDF.—It just won't also contain the Photoshop document. Either way, chose the PDF preset you need, and save that. When you open it in Acrobat you can add whatever you need.

…According to the online tutorials, I should now be able to save in the file type "Adobe PDF" but is's not appearing as an option. I can only save the file as a "Photoshop PDF," which won't allow me to make the changes I need in Acrobat.

By @allisono36740422

Photoshop PDF should provide all available options. Are you continuing through to the Save Adobe PDF dialog box and setting options appropriately in the five panels there? If you see an option you need there and it can’t be selected, be aware that the options available depend on what’s selected in the Standard and Compatibility menus. In general, the newer versions in those menus support more features for more modern PDF workflows, so if you need to set options that would have been used in an older workflow, try setting Compatibility to an older PDF version. Or see if a different Adobe PDF Preset or Standard helps.

If this is still confusing, what are the options you need to be able to add ALT text in Acrobat?