Yes, Instagram does show when you screenshot a dm.
When you take a screenshot of a dm, Instagram not only saves the image but also records the time and date that it was taken.
This information is included in the image’s metadata, which is visible when you view the image in the gallery or on the profile page of the person who posted the dm.
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Does Instagram notify you when you screenshot a DM?
It is not possible for Instagram to notify you when you screenshot a DM.
Screenshots are a way for users to record and share the contents of a message on Instagram, and as such, it is up to each individual user to decide whether or not to share them.
If you choose to share a screenshot of a DM, it is important to be aware of the potential consequences – screenshotting a DM may lead to negative reactions from the person sending the DM, and could also result in your account being temporarily suspended or closed.
Source: Does Instagram Notify When You Take Screenshots? (lifewire.com)
Will people know if I screenshot the chat on Instagram?
It’s possible that people might know if you screenshot the chat on Instagram, but this is generally not a problem.
Screenshots are typically used for documentation or to share interesting moments with friends and family.
Additionally, screenshots commonly include only part of the conversation, so it is unlikely that people would be able to understand everything said in a screenshot.
Source: Will people know if I screenshot the chat on Instagram? – Quora
Can people take screenshots of others’ DM on Instagram?
Yes, people can take screenshots of others’ DMs on Instagram.
To do this, simply press and hold the power button and volume down key simultaneously when you receive a DM on Instagram.
This will save the message as a screenshot in your profile’s Photos tab.
Can people see if I screenshot their DM on Facebook?
Yes, people can see if you screenshot their DMs on Facebook.
To do this, they will need to be friends with you and be logged into your account at the time that the conversation occurred.
Once they are friended, they will then be able to view all of the messages that were sent between you and them.