Moving pictures from a ssd to photos

As Matti Haveri says, we don't know what you mean. Are your ten thousand pictures in a Finder folder on your external SSD, or are they in a photoslibrary in a folder on the SSD? How did you "move" those pictures? What exactly do you want done with them? Do you use Photos? Do you use iCloud to sync Photos with other devices? What version of macOS are you using. All this things would help. Also, please tell us what you've tried and what happened.

Please read the following user tip and restate your question/problem in detail: 

     Writing an Effective Apple Support Communities Question - Apple Community

1. How is the external drive formatted?
2. Where do you want them to be located? In folders on your MBP or in a Photos library?
3. What problems are you having in achieving your end goal.
4. What have you tried and what were the results?
5. What system version are you running?
6. How much free space do you have on your boot drive?
7. Have you installed and run any "cleaning", "optimizing", "speed-up", anti-virus or VPN apps on your Mac?

So what is the problem?? Details, please.