segmentation export name

i am doing sementation of a single class.
i want to export my result as mask png format using Brush labels to PNG. the data is correct but the name are not and there is no way to match mask name with the actual image name.
they are named as follow: task-3-annotation-3-by-1-tag-tree-0.png
no matter how i modify exportName.
and there are no way to get a mapping between input name and mask name