Resolve Windows 10 related issues for your HP computers or printers by HP Windows 10 Support Center
Hp app updated now .docx files are not supported
If the "app" to which you refer is the HP Smart Mobile application,
Then the documentation indicates that this is true:
Word .docx files are not supported in HP Smart for Android.
I couldn't tell you whether this is an actual change from the way it has worked in the past.
HP Smart - iOS and Android >>> Download, How-to. Videos, and FAQ
HP Printers - Using the HP Smart App (Android, Apple iOS)
Mobile Printing – Options, How-to, Help, and Information
Print from your Android, iOS, or Amazon Fire device with the HP Mobile printing app.
Read this document first.
Open the section for your printer series > Find your printer and supported applications.
HP Printers - Mobile Printing Solutions Compatible with HP Printers
HP Smart for Windows
HP Smart is an application available in the Microsoft Store
Learn how to use HP Smart on your Windows 10 computer.
Open the Software and Drivers Support Website for your printer > Check the Box Get the App
HP Printers - Using the HP Smart App (Windows 10)
HP Smart for Mac
HP Printers - Install and Use the HP Smart App (Mac)
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