importing photos in Lightroom

select the sources (in my case *.jpeg and *.mp4 files in directory "tijdelijk/lightroom-input" of the hard disc" ) see left

'If I understand your workflow correctly, you are:

1. Outside of LrC, probably using Windows File Explorer, copying the images and videos from your cameras card to a folder on your hard drive.
2. Inside LrC, importing the files using the Copy option to copy them to another folder on your hard drive.

I must misunderstand, can you correct me. If you were to outside of LrC, to place the files in a folder on a hard drive, why not place them in the folder you want the LrC imports to be in, and during import, select Add.

I suspect this may not relate to your video issue. but it is kind of confusing. Also, see if the change in workflow helps or not.

Place this under the concept of something sounds wrong.

Two things to check:

"Don't import suspected duplicates" on the right side of the Import dialog box, is it checked? If it is, try unchecking it.

In the Preferences, have you checked "Treat JPG next to RAW files as separate photos"? If unchecked, try checking it.

Description of the process:
+ open lightroom (version 14.01)
+ select: "file --> import photos and videos" (top left site of the screen)
+ select the sources (in my case *.jpeg and *.mp4 files in directory "tijdelijk/lightroom-input" of the hard disc" ) see left site of the screen
+ choose "copy" on top of the screen
+ choose destination place on my hard disc (right site of the screen)
+ start import (click on "import button" bottom right site of the screen)
+ next screen:
* top left site: "copy and import files": nothing happens there
* in the middle of the screen: "importing files ...."
+ after 10 minutes nothing happens
+ click on X right from "copy and import files" (see top left site on the screen)
+ next screen: white rectangle with the text: "No photos or videos were found to import"and a button "OK"
+ click on button "ok".
+ next screen: white rectangle with text: "No smart previous were built, all smart previews were up to date"and button "ok"
+ click on "ok"
+ Result: No files were imported !!!!!

ISSUE: when I follow this process above trying to import *.DNG or *.NEF files, Result: these file are imported.
Result
So I can not import *.jpeg and *.mp4 files and I can import *.NEF and *.DNG files ??????

I hope You can soon find a solution for my problem

greetings
Wim Spijkervet

What happens when you try to import JPG and MP4 files? Please describe in detail. If possible, show us a screen capture (use the "Insert Photos" icon to include your screen capture in your reply; do NOT attach files)