Question About Adding Mods to my Modpack

[Sma04]

I've got a small modpack that is in very early stages right now. I want to add more mods to it, but whenever I insert a new mod into the pack, I start up the launcher, click 'Play' over my pack, but there is no option to update. The pack stays unchanged, with the orignal mods that were included when I first uploaded it and nothing else. I'm just wondering if I'm doing it wrong, or if anyone can tell me how to fix this.

If this information helps any...

-I am hosting the pack on dropbox, in the form of a .zip file.

-I am attempting to add the mods directly to that zip, waiting for the dropbox to update, and then starting up the launcher.

-When I notice that no mods have been added, I close the game, open the dropbox, and the mods I tried to add are still there.

Please forgive me if this is a simple problem, I'm sort of new to the hosting and editing of custom packs.

Thanks!

[TwoTails]

there is a version number/letter next to the name.

change it to something else (doesn't matter what) and the new mods will download

[Sma04]

there is a version number/letter next to the name.

change it to something else (doesn't matter what) and the new mods will download

Thanks for this! I just changed the version number, and the pack gave me the option to update. However, now its telling me that its having a problem unzipping. Do you know why this would be by any chance?

Edit: Nevermind, I figured it out and got it working. Thanks again!