,
I can see the next: errors in the log vum-log4j-fileupload :
Those messages are repeated every time you try to update the ISO. On the other logs I cannot see something relevant, however there are some entried for Offline Bundles that already exist in the Database. Something you can always try and you will not lose much information is resetting the Update Manager Database as it is described here: https://kb.vmware.com/s/article/2147284
That also applies for vSphere Lifecycle Manager as you can see.
Looking at the first screenshot and your details I can see you are uploading a 7.0 U1 ISO of the Dell image, from here I presume that your version of vCenter Server is more than that, is this right? If vCenter version is not equal or more then that is the issues as it does not have the vendor codes to correlate.
Finally, to confirm the last point, try to upload a 6.7 ISO into Lifecycle Manager and see if it works.
Regards!