Uploading stands for giving something of yourself to the wider world. Dream books link it to sharing work or feelings, and to the nerves of letting them go public.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.