File Explorer-Combine Files not selecting showing all selected files

We are having the same issue and have not been able to resolve it. However, we have found that if you "add" the files to adobe, this error does not occur. 

To Add the Files to Adobe:

Step #1: Open Adobe and your folder with the files side by side.

Step 2: Click on the tab, “Tools” in the top left. Then click on Create PDF on the right tool bar.

Step 3: A new page will appear, click on Multiple Files, Combine Files, then Next.

Step 4: A file explorer will open with your files.

Step 5: Click the box beside Name and all your files will be highlighted. Then ensure that the File name: bar is populated and click open.

Step 6: Ensure all your files were imported and then click combine. Look at the bottom right-hand counter to confirm that the total files match the count of files you intended to combine.

Annoying that if fails with no error, and there is no file count until you start the combine process. I have tried in both new acrobat and classic, results so far are like you describe above.

Hello, 

Sorry for the troubled experience, and thank you for reaching out and sharing your observations. 

seems to be an Win11 issue.
when you click "more options" in the context menu, you find another option "combine files with Acrobat". In my test the right one is the upper one.
Combining files fom Acrobat stillworks fine.

Hi @defaultjrhx2dc50p54 , 

I noticed that all of your file names are numbers.

Using numbers, special or reserved characters (such as some symbols, to include blank spaces) in file names,  is not considered a good practice in computing when employing file name conventions.

The same is true for Folders or Directory names, specifically when trying to perform batch actions with large groups of files on Windows, such as renaming files, saving as, moving or copying to another subfolder (or even in the same current folder where the batch action is executed from). 

Would it make any difference if you just prefix the filenames with a character, such as a letter?

For example, a1.pdf,  a25.pdf, a38.pdf  ... and so on.

If you must keep those PDFs files named with numbers, check if there are any restrictions in the current folder that could be enforcing conflicting file locks or read-only file attributes.

If that would be the case,  try to manually move or copy the files to different folder. 

If none of my suspisions are correct, did you verify if some of the PDF files themselves have any type of security restrictions (i.e. encryption)?