The upgrade from 24.04 to 26.04 is NOT currently supported; as that upgrade doesn’t open until after Ubuntu 26.04.1 LTS has been released.
The upgrades from the prior release, ie. from Ubuntu 25.10 ARE supported; as that is a much smaller upgrade; involving only ~six months of change; but this is normal procedure.
The point release detail (ie. 26.04 or 26.04.1) represents mostly new INSTALL MEDIA, and whether or not you use a 26.04 or 26.04.1 ISO to install a system, the installed system will still be 26.04.
The point release detail is an easy way to check to see if you’ve applied all upgrades. If you’re using Ubuntu 26.04, you don’t need to do anything special to upgrade to a newer point release; just apply upgrades normally and you’ll be using it normally the week before actual point release ISO release which is new install media.
I’ll provide a link to a 24.04.4 point release announcement, ie. Ubuntu 24.04.4 LTS released where the detail that may help understanding is
If you want to Quality Assurance test the upgrade from 24.04 to 26.04; you’re welcome to now, as it’s open for that (the -d or development option makes it possible), but that’s there for users who understand & are willing to accept the risk, and report bugs should they be encountered; so they can be fixed before it’s opened and supported for users who prize stability.
If you want stability, I’d wait until you’ve been offered the upgrade option; as that only occurs after the Ubuntu Release team have concluded its stable and thus supported. (look in https://changelogs.ubuntu.com/meta-release-lts and you’ll see Supported: 0 currently for resolute or 26.04)