[semi solved] How to add access to only Attachments from other flow with out rights to element ?

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[Webcon 2022.1.4.404]

I Have Process A [Main]
where I start sub-processes B [child]

from process B I copy attachments to process A by:
Daniel's solution
https://daniels-notes.de/posts/2023/copy-attachment-to-other-workflow
and put them to Item list A or Item list B as linked attachments (other way did not working ...)

all is fine but

in the next step I assign task to other users / group with no access to app where is done something (and attachments are added)

at the moment I did add rights to elements where are attachments and now:
- they see attachments and sub-flow elements ...

but there is any way to just add access to attachments with out access to elements?
(I changed access to crustal elements in sub flow - if user is not in particular group they do not see attributes of form but they see attachments and not crustal data)

I was just wondering there is other way to add right to attachments with out access to element ?