I and others have posted on this a few times, and either the answer doesn't work, or the question is ignored. I reviewed the Alternate text disappears in Acrobat DC that I found in another post about this subject, but that does not help , as it refers to adding alt text manually with Adobe Acrobat and my issue is with adding text in Word and it not coming over when converting to a PDF. There were other links in that post that no longer work at all.
I am using the latest version of Word, adding in the alt text for the images, then using the Acrobat Make Accessible option in the Microsoft Word ribbon. When the document gets converted to an Adobe PDF then goes through the Make Accessible options, when it gets to the detecting "figures with missing alternate text" it is finding many items that I had already added the alt text in Word are now missing that alt text. Sometimes it converts some of the alt text, and not others for images/objects in the same document! This is making for double work, and is particularly concerning when some of the documents we create in Word are hundreds of pages long with hundreds of images and charts. Here is a screenshot showing that the alt text is added in Word, but not found by Acrobat Pro. What is further concerning is that the Accessbility Checker report shows that only 6 figures need alternate text, however if you go to the accessibility tool and use the Set Alternate Text method, it shows that 8 of the 18 figures do not have alternate text. I'm not sure why the report is showing a different number of figures to fix than the accessibility tool. Is there a way in Word, an option that needs to be checked, an accesibility format to save as to force all of the alt tags that are already created in Word to show in the converted PDF document?
We pay for multiple subscriptions to many Adobe products, yet can never get help with issues.
[Mod: added poster's graphic into the thread.]
Edit and convert PDFs, General troubleshooting, Standards and accessibility