Photos Import Issue - Blank Screen - Lightroom Classic V 13.5.1, V 13.5

Try this. Click on Copy (Yes, I know you want to import using Add, but click on Copy anyway). Then make sure the Destination panel is present and expanded and pointing to a folder that actually exists. THen click back on Add.

If the Destination panel does not appear when you click on Copy, then right-click on File Handling and select Destination from the drop-down menu

You need to select folder(s) that have photos in them.  You have selected a higher level folder that does not have photo files in it.  If you select one or more lower level folders with photo files in them you will see the option to import them.

Lightroom Classic version: 13.5 [ 202408062022-6258095b ]
License: Creative Cloud
Language setting: en
Operating system: Windows 11 - Home Premium Edition
Version: 11.0.22635
Application architecture: x64
System architecture: x64
Logical processor count: 8
Processor speed: 2.4GHz
SqLite Version: 3.36.0
CPU Utilisation: 1.0%
Power Source: Plugged In
Built-in memory: 16221.0 MB
Dedicated GPU memory used by Lightroom: 159.2MB / 3937.0MB (4%)
Real memory available to Lightroom: 16221.0 MB
Real memory used by Lightroom: 1628.1 MB (10.0%)
Virtual memory used by Lightroom: 2034.5 MB
GDI objects count: 977
USER objects count: 2489
Process handles count: 5761
Memory cache size: 1731.5MB
Internal Camera Raw version: 16.5 [ 1953 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 378MB / 8110MB (4%)
Camera Raw real memory: -982MB / 16221MB (-6%)

Cache1:
NT- RAM:0.0MB, VRAM:0.0MB, Combined:0.0MB

Cache2:
m:1731.5MB, n:0.0MB

U-main: 71.0MB

System DPI setting: 96 DPI
Desktop composition enabled: Yes
Standard Preview Size: 1920 pixels
Displays: 1) 1920x1080
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 1650 (32.0.15.6070)
Init State: GPU for Image Processing supported by default
User Preference: Auto
Enable HDR in Library: OFF

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

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

Config.lua flags:

Adapter #1: Vendor : 10de
Device : 1f99
Subsystem : 142f1025
Revision : a1
Video Memory : 3937
Adapter #2: Vendor : 8086
Device : 3e9b
Subsystem : 142f1025
Revision : 0
Video Memory : 80
Adapter #3: Vendor : 8086
Device : 3e9b
Subsystem : 142f1025
Revision : 0
Video Memory : 80
Adapter #4: Vendor : 1414
Device : 8c
Subsystem : 0
Revision : 0
Video Memory : 0
AudioDeviceIOBlockSize: 1024
AudioDeviceName: $$$/dvaaudiodevice/SystemDefaultAndEffectiveDeviceName=System Default - Speakers (Realtek(R) Audio)#{comment}DVAAU-4201250: Open the audio hardware preferences page.
AudioDeviceNumberOfChannels: 2
AudioDeviceSampleRate: 48000
Build: LR5x120
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 1650/PCIe/SSE2
GL_SHADING_LANGUAGE_VERSION: 4.60 NVIDIA
GL_STENCIL_BITS: 8
GL_VENDOR: NVIDIA Corporation
GL_VERSION: 4.6.0 NVIDIA 560.70
GPUDeviceEnabled: false
OGLEnabled: true
[shortened to relevant information - Mod.]