There is no limit, but there is a limit when acquiring file names in a folder with FTP.
Instructions for uploading a large number of files
If no error occurs with the FTP software
Please upload by separating every 9000.
If an error occurs in the FTP software
Compress it with ZIP, etc., upload it, and expand it with a file manager.
STEP 1: Log in to cPanel.
STEP 2: Open File Manager.
Click File > File Manager.
STEP 3: Upload the zip file.
There is a size limit when uploading with a file manager. Please check the screen when uploading.)
STEP 4: Extract files.
Select the uploaded file and click Extract.
A dialog will appear, confirm and click Extract File(s), then click Reload.