Consider using First-Party Identifiers: FPID instead of ECID directly 

Cloud Service Publish instance(Asset share common) ???Is Asset share common available for Cloud  Service !

Open a Support Ticket: If you are using the student license version on your local for 6.5.14 or check with the Adobe Account manager if allowed to use or get it from your org adobe support portal 

When I click on it to edit from the content tree, it shows up blank  : Did you check the XP template structure or initial content if anything or is all the content getting rendered from the template's initial layout, Content tree will show content if it is part of the root container  

Did you check on the publish content tree workflow and have a custom workflow to publish content to the preview server 

could be memory try below  java -jar -Xmx1024m aem-author-p4502.jar -p 4502 -gui

did you check your role, i think you should have a developer role for the cloud manager product profile 

assuming ,  integrated adobe target through adobe launch extension. Also install adobe experience platform extension and configure it for target to see call going through for target  

an approach could be from the way audience has been defined, where rule could have list countries to be considered as part  audience example  for Asia audience  rule could be add only audience / people have countries like India , China etc 

i would suggest as a best practice to- Use Asset to have ALT and Description so details are centralized to DAM and later can be used by web/ marketing application so if same assets is used for marketing activity can have same ALT/Description and now a days assets scope is not limited to AEM site com...