1.Go to the site mc-pack.net
2.Click on choose file and select the file
3.Solve the captcha
4.Click on upload
5.It will give you download url and sha-1 hash copy both
6.Go to server files then server.properties
7.Search resource-pack
8.Paste download url in resource-pack
9.Paste sha-1 hash in resource-pack-sha1
10.Save changes
11.Restart server