Pano | Photo Merge Error "Unable to merge the photos"

Honestly, I'm not even sure what on my C: drive I can move over to another drive that has more space (e.g., the G: or E drives).

Several documents on the web on cleaning up Windows, for example

https://www.windowscentral.com/best-ways-to-free-hard-drive-space-windows-10/6

(many pages to look thru on that one)

1. Where do you keep your Camera RAW CACHE used by LrC, now that should clear upon LrC closure, but while in use (develop mode) it's location can effect performance. On a Windows computer, best if not on same drive as Windows paging file (typically the Camera RAW and Paging file will compete for read/wrights on the hard drive, , And best if on fastest non C drive.

Sorry, I'm not sure what you mean in #1 

 see tip 3 in the following: (note that you may want to purge CACHE before changing the location):

https://digital-photography-school.com/10-tips-to-improve-lightrooms-speed-and-performance-without-additional-hardware/

Ok, so concerns on C drive available space, hence attempt to relocate program. Probably not the most beneficial option.

1. Where do you keep your Camera RAW CACHE used by LrC, now that should clear upon LrC closure, but while in use (develop mode) it's location can effect performance. On a Windows computer, best if not on same drive as Windows paging file (typically the Camera RAW and Paging file will compete for read/wrights on the hard drive, , And best if on fastest non C drive.

2. Other documents. Speaking of files that are not programs, what files are on C that could be on another drive? Letters, pictures, images, spreadsheets, etc.

3. Files in download directory no longer directly needed. Say, updates, installs, etc, that were downloaded, then run to install programs. If needed for later, could be moved to non C drive.

4. Recycle bin. Things are not actually gone just because they were deleted.

5. Old programs no longer used, older versions of programs still on computer.

When you selected the images, where they smart previews? And where the originals not available?

@johnrellis my reply keeps getting deleted - I'm not sure if it's the system info or the google drive link

https://drive.google.com/drive/folders/1yU_mi7xdoXHKUCG3RuEudCkNBz0HkDqx?usp=sharing

https://drive.google.com/drive/folders/1yU_mi7xdoXHKUCG3RuEudCkNBz0HkDqx?usp=sharing

@johnrellis I'm also getting an error when trying to change the default drive from C: to G:

Lightroom Classic version: 11.4.1 [ 202206241800-b406ce4c ]
License: Creative Cloud
Language setting: en
Operating system: Windows 10 - Business Edition
Version: 10.0.19043
Application architecture: x64
System architecture: x64
Logical processor count: 12
Processor speed: 3.6GHz
SqLite Version: 3.36.0
Built-in memory: 16308.3 MB
Real memory available to Lightroom: 16308.3 MB
Real memory used by Lightroom: 8783.7 MB (53.8%)
Virtual memory used by Lightroom: 10570.8 MB
GDI objects count: 735
USER objects count: 2035
Process handles count: 2271
Memory cache size: 0.0MB
Internal Camera Raw version: 14.4.1 [ 1122 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 2234MB / 8154MB (27%)
Camera Raw real memory: 2235MB / 16308MB (13%)
System DPI setting: 96 DPI
Desktop composition enabled: Yes
Displays: 1) 2560x1440
Input types: Multitouch: No, Integrated touch: No, Integrated pen: No, External touch: No, External pen: No, Keyboard: No

Graphics Processor Info:
DirectX: NVIDIA GeForce GTX 1070 Ti (30.0.15.1165)

Init State: 5
User Preference: 1

Application folder: C:\Program Files\Adobe\Adobe Lightroom Classic
Library Path: G:\Lightroom\Lightroom Catalog.lrcat
Settings Folder: C:\Users\Tom\AppData\Roaming\Adobe\Lightroom

Installed Plugins:
1) AdobeStock
2) Facebook
3) Flickr
4) Nikon Tether Plugin

Config.lua flags: None

Adapter #1: Vendor : 10de
Device : 1b82
Subsystem : 67753842
Revision : a1
Video Memory : 8079
Adapter #2: Vendor : 1414
Device : 8c
Subsystem : 0
Revision : 0
Video Memory : 0
AudioDeviceIOBlockSize: 1024
AudioDeviceName: $$$/dvaaudiodevice/SystemDefaultAndEffectiveDeviceName=System Default - Speakers (THX Spatial - Synapse)#{comment}DVAAU-4201250: Open the audio hardware preferences page.
AudioDeviceNumberOfChannels: 2
AudioDeviceSampleRate: 48000
Build: LR5x38
Direct2DEnabled: false
GL_ACCUM_ALPHA_BITS: 16
GL_ACCUM_BLUE_BITS: 16
GL_ACCUM_GREEN_BITS: 16
GL_ACCUM_RED_BITS: 16
GL_ALPHA_BITS: 0
GL_BLUE_BITS: 8
GL_DEPTH_BITS: 24
GL_GREEN_BITS: 8
GL_MAX_3D_TEXTURE_SIZE: 16384
GL_MAX_TEXTURE_SIZE: 32768
GL_MAX_TEXTURE_UNITS: 4
GL_MAX_VIEWPORT_DIMS: 32768,32768
GL_RED_BITS: 8
GL_RENDERER: NVIDIA GeForce GTX 1070 Ti/PCIe/SSE2
GL_SHADING_LANGUAGE_VERSION: 4.60 NVIDIA
GL_STENCIL_BITS: 8
GL_VENDOR: NVIDIA Corporation
GL_VERSION: 4.6.0 NVIDIA 511.65
GPUDeviceEnabled: false
OGLEnabled: true
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https://drive.google.com/drive/folders/1yU_mi7xdoXHKUCG3RuEudCkNBz0HkDqx?usp=sharing

Initial troubleshooting steps:

1. Do Help > System Info and copy/paste the entire contents here.

2. Select two or three photos that won't merge and upload them to Dropbox, Google Drive, or similar and post the sharing link here. We can see if the problem is with the photos or your LR installation.