And? From the doi.gov site, just as an example:
"Text messages (including the contextual information such as the sender, recipient,date, and time) that are sent or received by employees with government-issued or personally-owned devices must be collected and processed for potential release under the FOIA if they pertain to agency business and are responsive to a pending FOIA request."
"When utilizing the screenshot approach, the record custodian identifies the text messages that are responsive to the FOIA request; takes screenshots of those responsive text messages directly from the mobile device; and transmits the screenshots to the responsible FOIA office for processing, for example through email from the device itself."