Currently, our QloApps Marketplace does change our front end design. But our theme is very flexible. You can change the content of the front page to make it look like a Marketplace.
You can change the headings, descriptions, and images of different blocks of the front page and that will do the job.
Many of our customers are successfully doing it and they are happy with it.
Apart from that, we are also working on a theme for our Marketplace. But how much time it will take cannot be confirmed right now.
So if you want a theme urgently then you can contribute it to the community yourself. We will love that.
Please set max_upload_filesize and post_max_size values on your server to the value more than the size of image you want to upload.
Please set 16M to both the variables once and then upload the image.
We have checked for this issue from our side on various PHP versions but we have not encountered this issue on any of them. So this issue can be a server specific issue.
So I recommend you to raise a ticket at https://webkul.uvdesk.com/en/customer/create-ticket/
And on the ticket please share your FTP details and the QloApps admin details with us.
We will hunt down the issue and resolve it.
As I mentioned earlier also that for those fields whose translation does not exist by default system show those fields in default language rather than showing them blank.
And the only way around is to translate those fields manually.