I don’t want dummy files that only download when I want to use them. I work with a lot of 100-500mb files and I will be really annoyed if I have a 30second dela

I don’t want dummy files that only download when I want to use them. I work with a lot of 100-500mb files and I will be really annoyed if I have a 30second delay every time I open one of these or even worse not be able to access them because the internet is down wherever I am. I’ve already moved to Nextcloud but if I hadn’t this would push me to.