Regarding showing file rejection without reason.

If you can't handle rejection, don't be an actor or a Stock Contributor. 😊

This is what Stock has to say about 'similar content.'

• https://helpx.adobe.com/stock/contributor/help/how-to-submit-distinct-content.html

 

You may know how much time it takes to prepare a file completely. But if at the end of the work, if you see it damaged, then your mind becomes very bad and there is a reluctance to work.

By @robinhasan

You are free to stop contributing or to contribute more to other agencies, if that makes you feel better. As long as you contribute here, Adobe will make the rules.

All rejections are for reason. And contributors can't help here.

Checking this forum would have shown to you, that there are hundreds of people complaining about this refusal. Adobe thinks that their checking is working fine. You'll have to live with that refusal.

Some people think that reviewing carefully the titles and Keywords will help to overcome the issue, at least partially.

The answer to this problem is on this page.
It applies not only to similar assets, but also to titles and keywords.
If all your assets have the same title or keywords, they will be buried under other assets and will not appear in searches.

https://helpx.adobe.com/stock/contributor/help/how-to-submit-distinct-content.html

In the meantime, here are some hints:

1. Think outside the box. WAY outside the box. So far outside the box that you end up on the other side of the box.
2. Concentrate on CONCEPTS, not things. Or things that promote or symbolize a particular concept. Stress that concept in your titles or keywords.

3. Provide unique but accurate titles and keywords, and avoid or place at the bottom of the list any keywords recommended by Adobe Sensei.

The similar content issue has been around for months and many if not all contributors are affected by it to one degree or another. Search the forum for "similar content" to see what others are experiencing. The matter has been discussed at length.