Failed to upload any files to default content libraries and failed to import monitoring apps after the installation

On a single-node environment.
After the installation, the monitoring apps does not exist. 
Tried to import from Default Apps folder failed. "Command=Import app;Result=400;ResultText=Error: Bad Request"
Subsequently tried to import other apps with In App images also failed.
Unable to upload any files (.jpg, .png, .txt) into Default content libraries with the error 'Failed to upload file'. 

The service account is not in the administrators group.

 

Windows Qlik Sense services user that is not an administrator

If you wish to use a dedicated Windows user account that is not an administrator to run the Qlik Sense services, you must create that account before you install Qlik Sense. The Windows Qlik Sense services user runs the following services:

• Qlik Sense repository service
• Qlik Sense proxy service
• Qlik Sense engine service
• Qlik Sense scheduler service
• Qlik Sense printing service
• Qlik Sense service dispatcher

For more information about services,

The Windows Qlik Sense services user that is not an administrator must meet the following requirements:

• Member of the Qlik Sense Service Users and Performance Monitor Users groups.

  You add the Windows Qlik Sense services user that is not an administrator to these groups after you install Qlik Sense.

• Only used for Qlik Sense Windows services. This is necessary to avoid conflicts with other Windows services in the same computer.

Double check to make sure the user has Full Control to the 3 main directories for Qlik Sense.
C:\Program Files\Qlik
C:\ProgramData\Qlik\Sense
Shared folder
 
More details can be found from QlikHelp.