Nextcloud download cannot go over 4GB

I installed nextcloud with dietpi, and uploaded all my files.
The issue is that when i want to dowload a big file (over 4GB) , the dowload can not go over 4 GB. It does not crash but it just can’t send bigger zip files than 4GB. I m afraid to loose all my data knowing that i can’t download it all at once.

Help pls

Do you use FAT file system? That one indeed has a max file size of 4 GB.