Are "au" & "ue" vowels?

Short answer: No, あう and うえ are not "Japanese vowels". You are right, Japanese has only 5 vowels, あ, い, う, え and お.

The app you are referring to in the comments is Skritter, not Skitter.

The lesson "hiragana" contains different sets of vocabulary words to learn along hiragana, and they are classified in groups. I think it's just silly that they decided to group the words "au" あう and "ue" うえ along with the vowels in a particular group, its misleading:

あう and うえ are just Japanese words that happen to be formed by vowels only, but they are no vowels itself. If you click on the section Japanese vowels, you will find that whereas あ, い, う, え, お are marked as just "hiragana", あう and うえ are listed with their meanings as a word, namely "to meet" and "up, above":

I believe that the (poor) reason why they decided to place the words あう and うえ with the vowels is that they are formed by only hiragana vowels, but I think this approach is prone to confuse the beginner. Moreover, there are other words formed by vowels only (い "stomach", え "picture") that are not in that group, so I don't see the point on grouping あう and うえ along with the vowels... All the other words presented in the lesson seem to be grouped by consonants (S category, T category and so on).

Follow these steps to add an image to your question from your android mobile phone:

1. Access japanese.stackexchange.com from Google Chrome Android:

2. Go to your question an click on "edit"

3. Click on "Add picture"

4. (Arrow #1 in the screenshot below) Click on "Click here to upload tour image"
5. Browse your phone and select the screenshot you took
6. (Arrow #2 in the screenshot below) Click on "Add Picture"

7. Save your edit

Once you have uploaded your screenshot the community might be able to help you.

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Edit: you can upload a picture from the application also. See:

1. Once you are in your question, click on "edit"

2. The text editor will open. Click anywhere on the text, and the edit buttons will appear.
3. Click on the small button with camera icon to upload an image

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Second edit:

You can also get the Stack Exchange app to ask you to open a page in Chrome or Stack Exchange instead of opening ot directly in the app, if it helps:

1. Go to Settings

2. Go to Apps

3. Go to Apps

4. Type "Stack" and click on the result Stack Exchange

5. Click on "Open supported links in the app" and make sure that "Ask every time" is selected.

Then, the next time you try to edit the question from Chrome, the system will ask you to choose. Choose Chrome (not the app) and follow the steps I posted above.