As long as you are working form the desktop recipe from the "Cloud" folder, all changes you make on the desktop should be available from the cloud on the app as well, and vice versa. The cloud folder syncs between all devices. If you make a change to it on the desktop and save, and you have the recipe currently open on the app, you'll need to close the recipe and re-open it to see the changes. Likewise, if you make changes to the recipe on the app and save, you'll need to close and re-open on the desktop to see the changes. If you make changes on both devices, whichever saved last ig going to override the other changes. It does not sync the way a Google Doc does, in which multiple people/devices can work on the same document simultaneously.
Any recipes on the desktop or the app that are NOT in the cloud folder will not sync between devices.