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Change the file name of attachment

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Posted on by AN-23070114-0

Hi everyone,

When creating the auto save attachment rule in Outlook mail, I also want to change the file name of the attachment as: "YYYY.MM.DD.pdf" or "YYYY.MM.DD.xlsx" , Could anyone help me to change the files name please?

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Chriddle 8,685 Super User 2026 Season 1 on at

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Use this expression as filename:
concat(utcNow('yyyy.MM.dd'), '.pdf')

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AN-23070114-0 on at

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Could you please help me how to use 6-end letter of the file name to set the name of the attachment?
Thank you in advance !

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Chriddle 8,685 Super User 2026 Season 1 on at

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Your are talking about the file extension?
You can get it with
last(split(the_file_name, '.'))

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AN-23070114-0 on at

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I mean the attachment name is "Bang_so_1_CN_270323.pdf" and I want to set the name of file like the red box below. Could you show me how to set rule to save the name like this?

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Chriddle 8,685 Super User 2026 Season 1 on at

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If the fields in the name are divided by an underscore, the easiest approach would be this:
last(split('Bang_so_1_CN_270323.pdf', '_'))

If not, and you always need the last ten characters, you can use this:
substring( 'Bang_so_1_CN_270323.pdf', sub( length('Bang_so_1_CN_270323.pdf'), 10 ), 10 )
or a bit safer (no need to repeat your value and it works with too short names as well)
join( reverse( take( reverse(chunk('Bang_so_1_CN_270323.pdf', 1)), 10 ) ), '' )

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Chriddle 8,685 Super User 2026 Season 1 on at

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Just checked, the length in substring is optional and not needed here:

substring( 'Bang_so_1_CN_270323.pdf', sub( length('Bang_so_1_CN_270323.pdf'), 10 ) )

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AN-23070114-0 on at

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Hi Chriddle,
Because the file attachment name is not fixed as "Bang_so_1_CN_270323.pdf", so can you suggest me how to a get the last character of the attachment name?

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Chriddle 8,685 Super User 2026 Season 1 on at

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You are talking about the last character before the dot ("Bang_so_1_CN_270323.pdf")?
Here are some ways to get it (from sane to hilarious) 😉
last(split('Bang_so_1_CN_270323.pdf', '.')[0]) reverse(chunk('Bang_so_1_CN_270323.pdf', 1))[4] take(skip(reverse(chunk('Bang_so_1_CN_270323.pdf', 1)), 4), 1) substring('Bang_so_1_CN_270323.pdf', sub(length('Bang_so_1_CN_270323.pdf'), 5), 1) chunk('Bang_so_1_CN_270323.pdf', 1)[sub(lastIndexOf('Bang_so_1_CN_270323.pdf', '.'), 1)] substring('Bang_so_1_CN_270323.pdf', sub(lastIndexOf('Bang_so_1_CN_270323.pdf', '.'), 1), 1)

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AN-23070114-0 on at

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Hi Chriddle,
I mean the attachment name is not fixed, for example: its name can be Bang_so_1_CN_270323.pdf, Bang_so_1_CN_280323.pdf,... This name will change everyday when I received the email. So I don't know how to put the attachment name in the split function of your formula: last(split('Bang_so_1_CN_270323.pdf', '.')[0]).

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Chriddle 8,685 Super User 2026 Season 1 on at

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Ok, here an example:

AttachmentNoWithFileExtension:
last(split(items('Apply_to_each_Attachment')['name'], '_'))

AttachmentNo:
first(split(last(split(items('Apply_to_each_Attachment')['name'], '_')),'.'))

Output:

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