Please post your System Information as Lightroom Classic (LrC) reports it. In LrC click on Help, then System Info, then Copy. Paste that information into a reply. Please present all information from first line down to and including Plug-in Info. Info after Plug-in info can be cut as that is just so much dead space to us non-Techs.
Lightroom Classic version: 11.5 [ 202208080927-8a575c91 ] License: Creative Cloud Language setting: en Operating system: Windows 10 - Business Edition Version: 10.0.19042 Application architecture: x64 System architecture: x64 Logical processor count: 8 Processor speed: 3.3GHz SqLite Version: 3.36.0 Built-in memory: 16326.1 MB Real memory available to Lightroom: 16326.1 MB Real memory used by Lightroom: 491.5 MB (3.0%) Virtual memory used by Lightroom: 6565.4 MB GDI objects count: 1112 USER objects count: 3401 Process handles count: 3123 Memory cache size: 3.5MB Internal Camera Raw version: 14.5 [ 1177 ] Maximum thread count used by Camera Raw: 5 Camera Raw SIMD optimization: SSE2,AVX,AVX2 Camera Raw virtual memory: 835MB / 8163MB (10%) Camera Raw real memory: 842MB / 16326MB (5%) System DPI setting: 96 DPI Desktop composition enabled: Yes Displays: 1) 1920x1080 Input types: Multitouch: No, Integrated touch: No, Integrated pen: No, External touch: No, External pen: No, Keyboard: No
Nothing to do with your problem, I think, but a very old GPU, no longer supported, not 4K and beyond, GPU driver v391.25, a newer one exists v391.35, but that is four years old. I would NOT in the preferences set the option to use Graphics Processor on, you probably can not, as non 4K it will be of no value, and on this old GPU it may make performance and dependability worse.
I suspect the AI Sky mask fails??
What is your e-mail provider?
Not a champ of photos via e-mail. Coming from a Info Tech Manager experience, would use a photo share like Smugmug, and e-mail link to whoever as opposed to attachment. But at any rate,