Fiori wave 2 logon page customization error

Hi,

We are trying to customize our logon page in fiori wave 2.I would like to upload an image so that it gets reflected on Fiori logon page. I have followed the below path.

SE80->MIME Repository->SAP->Public->BC->UI2->Logon->img->right click->Import MIME objects.

I get the popup saying “Error when loading file”.

Could you help us with this issue?

Regards,

Ann