Step 4: Upload the whole folder
Drag your folder (for example picks) into the main folder. Wait until every file has copied.
Bring the hidden files too. A few files have names that start with a dot, like .htaccess, and some apps hide them. In FileZilla, open the Server menu and turn on "Force showing hidden files".
An easy way to keep every file: many file managers let you upload the zip itself and unzip it on the host (look for Extract). Then rename the seenin folder there, as in step 2.
Most hosts need nothing more. If your host uses nginx (a kind of web server; your host's support can tell you), send them the short note at the end of the technical guide.