DW 2021 and iOS 26

BETA test versions are incomplete & not for production use. 

Most Creative Cloud apps work on these systems, no more than 2 versions back:

• Windows 11 (64-bit) versions 24H2, 23H2; Windows 10 versions 22H2, 21H2;
• MacOS 15 (Sequoia), 14.7 (Sonoma), 13.6.7 (Ventura).

- https://helpx.adobe.com/creative-cloud/system-requirements.html
- https://helpx.adobe.com/dreamweaver/system-requirements.html

NOTE: MS is ending Win10 in Oct. Apple will release macOS Tahoe (26) later this year.

Dreamweaver has never run on iOS before and there have been no plans to announce that it would run on iOS. Upcoming there is a new release of OS 26 for Mac, but as that is still in beta and not publicly available it is likely new issues may arise as with any brand new OS release or it's also possible that the issues may be fixed in the public release of the software.

At most, you can try updating DW to the latest version which is 21.6 and see if that resolves your issues.