Print Based on File Name


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# 1  
Print Based on File Name

Morning,

I have an issue to print files based on file name
my input file
Code:
20170516_WATERSONGS.txt
20170509_MULTIFLAG.txt

every file consist of list of number, for ex 20170516_WATERSONGS.txt
Code:
7281370247390
7281370605338
7281370836600
7281370840039
7281372341119
7281372821958
7281374319089

20170509_MULTIFLAG.txt

Code:
2585296582710
2585296835209
2585296940311
2585297027737
2585297122509


I need to print all my input files as expected below
Code:
20170516|7281370247390|WATERSONGS
20170516|7281370605338|WATERSONGS
20170516|7281370836600|WATERSONGS
20170516|7281370840039|WATERSONGS
20170516|7281372341119|WATERSONGS
20170516|7281372821958|WATERSONGS
20170516|7281374319089|WATERSONGS
20170509|2585296582710|MULTIFLAG
20170509|2585296835209|MULTIFLAG
20170509|2585296940311|MULTIFLAG
20170509|2585297027737|MULTIFLAG
20170509|2585297122509|MULTIFLAG

I did this
Code:
awk 'FNR == 1 {nm=substr(FILENAME, length(FILENAME)-25, 8)}{mm=substr(FILENAME, length(FILENAME)-5, 8)} {print nm "|"mm"|" $0}' *.txt

please help
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