Sometimes copying and pasting code doesn't work as expected. It could be due to formatting errors, missing dependencies, or incorrect syntax. Troubleshooting and debugging may be necessary to get it to work. For more detail, click here.

I'm not getting any errors.

I copied and pasted the codes in the project and when I say "they are not working" I mean, they don't look like the demos.

Anyway, seems to be I was working on this base 'MDB5-STANDARD-UI-KIT-Free-4.4.0', now I started a new project on this one 'MDB5-STANDARD-UI-KIT-Pro-Advanced-4.4.0', copied the html code I had, and worked.

So that was the problem.

Should I start a clean fresh project in order to make it work?

Is there any way to change my current project to react package if necessary?

I started this project: MDB5-REACT-UI-KIT-Pro-Advanced-4.1.0

Then I copy paste any of these

https://mdbootstrap.com/docs/standard/plugins/multi-item-carousel/

And none of those work, it just shows the photos.

Also tried on the "team" template, which is the base I used.

If you have a problem with getting our package to work please check and post here any console errors you may get. Also maybe try copying your code to snippets to check whether there is a problem with your code or maybe if the package is not linked right. https://mdbootstrap.com/snippets/

Please describe what exactly is not working.

Since you posted in Standard I suppose you have MDB Standard package. React bootstrap examples are intended for React package.