Here are a few extra comments for anybody planning to try this out:
1. There is no initialization step/blocks. FGL Enhance does this on their end on the website.
2. The first screenshot shows a reward video. I made mine in two steps. The first step was pressing on the "watch video" actor. It performs two checks to see if the ad is ready before saying it fails. There are no "fetch" commands. If it is ready, I wait for the reward to be granted and then give the player gems.
3. The interstitial ad is incredibly easy. Just use the "show" block.
4. After publishing the ipa or apk, upload it to the FGL Enhance site. Once it is uploaded, it will prompt you to continue.
5. The next screen shows all of the available ad networks. Here, you copy/paste all of your App IDs, pub IDs, placement IDs for the various ad networks. For generic things like pub IDs, it copies them into each ad type. Ad networks with different ID numbers for each placement need to be paste in individually.
6. Click next. Put in your p12 for apple and keystore for android. It enhances your app. Then, you can download the file with everything ready for uploading to the app store.
7. After everything is done, you can manually adjust the percentage of ads on the FGL Enhance website. You can customize primary and secondary networks. For me with three networks, I had 50/50 on two primary networks and 100% on one secondary network. I adjusted it yesterday to be 50% on one and 25% on the other two - all as primary.
Hope this helps.