I'm not sure what you mean.
To create a MOMENTARY Snapshot you need to use Press/Release, but the RELEASE to get back to the original SS needs to be on the Target SS:
SS1 FS1 Press>SS2
SS2 FS1 Release>SS1
You cannot, in another SS, go to SS2 and have the RELEASE of SS2 set to go back to THAT SS because it is already set to go back to SS1:
SS3 FS1 Press>SS2
SS2 FS1 Release>SS3
Whereas:
SS3 FS1 Press>SS4
SS4 FS1 Release>SS3
will work fine.
If this does not describe your issue, attach an example preset with specifics re what you are trying to accomplish.