P: Tags are not saved in metadata

I have decided to move away from another solution and use lightroom web for my photo storage.

When I imported my 20.000 photos, I would see all the meta keywords (tags) I put to my photos using the previous tool.

Unfortunately, when I add a tag in my lightroom (web) the tags are correctly updated on the platform but not on the actual photo. When I download it, it still shows the original meta tags.