Create Folder Action - Provide unique default name

[hosy]

Steps to reproduce

1. Open File list
2. Perform action Create Folder
3. Tap Done
4. Perform action Create Folder again
5. Tap Done

Result:
Error: Couldn't create New Folder

Expected behaviour

If the folder New Folder already exists, the Create Folder action should provide a new unused folder name like New Folder 2

Actual behaviour

Error: Couldn't create New Folder

Client

iOS version:
12.2

ownCloud app version:
1.0.0 Build 119