I am trying to set up in-app purchases but I don't know how to get rid of "Missing Metadata" shown below.
The only yellow dot I see from the page is the "Localizations" section, but I completed the "Display Name" and "Description".
I don't know what else I can do or what I am doing wrong.
Add any type of screenshot of the app here. Then Save and submit. It should work.
I had the same issue with a renewable subscription. Near the top of iTunes page, just below your image that says "Missing Metadata," I saw this:
I clicked on "Add Localizations" which took me to the group. There is a broad frame instructing you to click somewhere else. Click on the little blue circled plus to the right of "Localizations."
After selecting the language I filled in "Subscription Group Display Name" and saved. The IAP status immediately changed to "Ready to Submit."
A screenshot of the product as it appears on the device. This screenshot is used for Apple’s review only and is not displayed on the App Store.
Screenshots requirements are outlined below:
- iOS requires at least 640 x 920 pixels.
- tvOS requires 1920 x1080 pixels.
- macOS requires 1280 x 800 pixels.
Source: https://help.apple.com/itunes-connect/developer/#/dev84b80958f
Any 1024x768 png image file added to the screenshot in Review Information has solved the issue
For iOS in-app purchase, you need an image size of at least 640 x 920 pixels.
iOS requires at least 640 x 920 pixels.
tvOS requires 1920 x1080 pixels.
macOS requires 1280 x 800 pixels.
These are the Apple guidelines.
Add a screenshot to your review part at the bottom and it will change to ready to submit.
In my case the issue was information missing under the "Group Reference Name". Would be nice if error message was more specific. 
Use Opera browser, it solved my problem by uploading below: iOS requires at least 640 x 920 pixels for Review Screenshot
Same issue here. Solved uploading an image generated with the simulator:
- Run the app in the simulator, go to the VC with the In App Purchase information.
- Cmd + S -> This creates a screenshot of the simulator with the device resolution.
- Find the screenshot just created in the desktop.
- Drag & drop it to the AppStoreConnect/YourApp/Features/In-App Purchases/Review Information/Screenshot.
For me, It was the subscription group name I missed. Add at-least one localization.
Near the top left under a few other things there is a "Duration" drop down that asks you how long you want your subscription to be (assuming it is a subscription you are doing).
I think this is what I missed the first time, or possibly the screenshot for the testing at the bottom.
Swapped to "Ready to Submit" right when I saved everything this time, now I just need to upload a new build! Good Luck!
In my case the problem was that the price wasn't specified; I didn't actually have sufficient permissions to set a price (my role was 'Developer') so the section didn't appear and I didn't notice it was missing.
来源：https://stackoverflow.com/questions/39683170/in-app-purchases-stuck-in-missing-metadata-state