Why the document will be checked out by default when uploading it

Question

I did the following:-

1) I created a new modern SharePoint page >> inside it i added a Button web part, as follow:-

2) The url for the button refers to the upload dialog for a document library, as follow @ "/sites/POS-DocumentApprovalProcess/_layouts/Upload.aspx?List=%7b71b0e1f5-c427-44f8-9147-cb24d9df8dd8%7d"

3) Now I click on the Button >> upload the document, as follow:-

4) Then i will be redirected to the edit properties form (since the document library has a custom content type with custom columns), as follow:-

5) after that i populated the required properties >> click on Save.

But the issue is that the uploaded document will be checked-out by default as follow:-

so can anyone advice why this is happening? why the document will be checked-out after been uploaded?

I checked the versioning settings for the document library and i have the following, so the document should not be checked-out by default when been uploaded and edited !!!:-

Answer 1

Do you have any required fields besides Name in this library/attached to the custom content type?

Please check under Column Settings via Content Type > Columns and make sure they are all switched to “Optional”. Or change their status to "Hidden" if not needed.
If you need the columns to contain information, make sure they all display and are filled in on the Edit Form before uploading.

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