No support from the manager and additional tasks

With no option but to work on all the tasks assigned by the onsite team, I was expecting at least some support from my manager to stand against them and convey that we will work on the documents once we get finalized requirements from the client. Therefore, I started my work by prioritizing all the task lists shared by the onsite and was looking to address those tasks as early as possible. However, out of nowhere my manager inquired me about the open tasks and believing that my manager will support me in getting it completed, I gave a status update on all tasks. He closed the conversation with just a single acknowledgment and did not bother me with my task list. Within a few minutes, my manager messaged me again with new work out of nowhere and wanted the work to be completed within a short time. Now, I had two tasks in my hand, a task assigned by the onsite team and the additional task was from my manager with irrelevant details. To know more on how I completed both tasks, please feel free to check out the blog posts in "G R Team Sites”.