Navigate to "Documents\Rainmeter\Skins\Droptop Community Apps\Apps\"
Copy and paste one of these apps you'd like to use as a template for creating your app. Rename the folder to the name of your app, followed by your name. For example, rename "SampleApp1-Cariboudjan - Copy" to "SystemMonitor-JohnSmith".
IMPORTANT - Your folder's name must be one word with no spaces, like in the example above. It's recommended that you use the format shown above. Example: AppName-YourName
Go to the Droptop home button >> Select "Droptop settings" >> "Community Apps" >> Select a slot >> Select your new app. If it isn't already enabled, right-click on the Droptop app tray (top-right corner) and make sure that app slot is enabled.
In your app's folder, edit the CustomApp.ini file. Edit the "NumberOfItems" variable to reflect the number of items in your dropdown menu (Maximum 10). Change "NumberOfBoxes" to reflect how many boxes you'll be using (Maximum 5).
Step 6 Below that, you'll see ItemTextX, ItemIsFolderX, and ItemActionX. These represent each item in the Dropdown menu, in order from the topmost item to the bottommost item in the list. If ItemIsFolderX is a folder that opens more options, set that value to 1. Otherwise, set it to 0.
Set each item's action. To set an action, you must have an understanding of Rainmeter bangs. Bangs are instructions of what action to perform when that item is selected.
After you've made a few items for your dropdown menu, now you can make icons for your dropdown menu. First, create a fun button for your app in the top bar. Go to the "Button" folder in your app folder. Inside you'll see two folders called Medium and Small. Edit the .png files in Photoshop, GIMP, or another advanced image editor. Create a 32x32 sized icon for your app in the "Medium" folder, and a 16x16 sized icon for your app in the "Small" folder. The canvas size of each icon should remain the same. Edit the file - Do not replace the image with another image. The icon you create should always be a pure white color.
You can now also make icons for all of your individual items in the dropdown menu. Under the "Icons" folder, you can replace these icons with any 32x32 icon. The icon you create should always be a pure white color.
Repeat this step for any submenus you've created for your app. Go to Folder\Icons\ and set the icons in the same way as you did in Step 9 for the folder number that corresponds to the position of that submenu in the dropdown menu.
Continue editing the CustomApp.ini until it meets the design you had in mind. When you're finished, proceed to compile and share your app with the world.
How to share your app
Go to Documents\Rainmeter\Skins\Droptop Community Apps\Apps\
Delete all of the apps except the app you're sharing
Right-click on the Rainmeter icon in the system tray. Select Manage >> Create .rmskin package.
Enter the name of your app, the author (your name), and a version number of your choice.
Select "Add skin..." and select "Droptop Community Apps" from the dropdown menu. Press "Add". If there are any plugins necessary for your app, select them with the "Add plugin..." button. Otherwise, select "Next". Under "After installation", keep the "Do nothing" button selected.
Step 6 IMPORTANT - Go to the "Advanced" tab and check the "Merge skins" box. Make sure this box is selected.
Select "Create package". After a few seconds, a .rmskin file will be located on your desktop. This is the installer for your skin. When others install this package, your app will appear in their list of available custom apps.
Step 8 Go back to the "Droptop Community Apps\Apps" folder. Press Ctrl+Z to get your other community apps back from the recycle bin.
Share your creation on the Droptop Discord #app-releases channel.