TLDR: The circuit network variable for accumulators can not be copy-pasted by shift-clicking.
The circuit network information can usually be copied by shift-clicking on the relevant inserter, train, logistic chest or similar but this does not work accumulator. This might be a design decision but to me it seems hard to motivate why this should not work.
Thanks
BlueBaron
[boskid][0.17.72] Unable to copy accumulator variable by shift-click
Re: [boskid][0.17.72] Unable to copy accumulator variable by shift-click
Thanks, this issue and related issue of blueprint placement over existing accumulator are fixed for [0.17.73]