Gsa Ser does not have important URLs in all selected projects

I'm trying to import target URLs from a text file. The file size is larger than 1200 MB and I try to add it to selected projects. The number of projects is 150. When I choose to import target URLs from a text file, the text file is imported but it does not add URLs to many projects. As if this added URLs at project startup and last, and when I randomly check some projects for the remaining target URLs, it displays zero. Please, anyone can help me import URLs from a file and make sure all selected projects get some of the target URLs of the file.