I modified a bit the theme by creating a child theme. All new udpates work fine except the logo that is impossible to upload.
I tried to do it through the menu “Customize” → “Website’s indentity” → “Upload the logo”. But when I upload my logo, I have just the name of my website that completly brokes the style of my blog.
Please ensure that you have installed all the pending plugin updates for the theme then remove the logo and save the changes to reset the feature and try adding the logo once more.
I have tested it on my test site and it’s working fine for me using latest version of Activello theme.
It seems this is not working on your shared site because of the child theme you are using on your site so to resolve the issue modify your child theme as described in the following topics.