Acrobat does not merge the files, then these files are not readable because PDF files are compressed. Why Can't Merge Multiple PDFs into One File in Adobe Ac in IE 10? Sep 13, 2023 — The reason is that Windows 10 includes multiple PDF files by default. When trying to merge two separate PDFs into one file, Adobe Acrobat Reader Windows 10 issues a combined files error, and there is no workaround. Can't Combine Multiple PDF Files into One File in Adobe Acrobat DC Jun 15, 2023 — Some users report that the issue is resolved when upgrading from a previous version of Acrobat DC, and that is not true for other users. When you try to import multiple PDFs into Acrobat DC, it crashes or won't import them. Solution — Adobe Support Community Why can't I combine multiple PDF files into one file in Adobe Creative Suite in Microsoft Windows? Jun 22, 2023 — When you combine PDF files into a single file in a number of different Creative Suite programs (Adobe Photoshop, Illustrator, Sketch, InDesign and others), it creates a black hole of space in a space where the file would normally be. This can also lead to the files not being properly read, which may prevent your documents from working at all. Solution — Adobe Support Community Why Can't I combine multiple PDF files into one file in Adobe Creative Suite in Microsoft Windows? — I've done a lot of experimenting and found that it is probably the file size (2 GB vs 2 GB). This was especially noticeable in Word because of the large number of PDF files it imports. Solution — Adobe Support Community How to Combine PDF Files into a Single File in Windows Explorer (In Windows XP Professional) How to Combine PDF Files into a Single File in Windows Explorer (In Windows XP Professional) How to Combine PDF Files into a Single File in Windows Explorer (In Windows XP Pro) When Microsoft Office 2023 or Office 2023 RT is installed on the computer, when you combine PDF files into a single file in the file explorer, a combined error message is displayed. Solution — Adobe Support Community How to Merge Multiple PDF Files into a Single File in Mac OS X How to Merge Multiple PDF Files into a Single File in Mac OS X When Adobe Illustrator is installed on the computer.