Update the copy for the link previews preference.

Signal/src/ViewControllers/AppSettings/PrivacySettingsTableViewController.m

@@ -316,8 +316,10 @@ static NSString *const kSealedSenderInfoURL = @"https://signal.org/blog/sealed-s
                                             isOn:SSKPreferences.areLinkPreviewsEnabled
                                           target:weakSelf
                                         selector:@selector(didToggleLinkPreviewsEnabled:)]];
-    linkPreviewsSection.headerTitle
-        = NSLocalizedString(@"SETTINGS_LINK_PREVIEWS", @"Setting for enabling & disabling link previews.");
+    linkPreviewsSection.headerTitle = NSLocalizedString(
+        @"SETTINGS_LINK_PREVIEWS_HEADER", @"Header for setting for enabling & disabling link previews.");
+    linkPreviewsSection.footerTitle = NSLocalizedString(
+        @"SETTINGS_LINK_PREVIEWS_FOOTER", @"Footer for setting for enabling & disabling link previews.");
     [contents addSection:linkPreviewsSection];
 
     self.contents = contents;

Signal/translations/en.lproj/Localizable.strings

@@ -2091,7 +2091,13 @@
 "SETTINGS_LEGAL_TERMS_CELL" = "Terms & Privacy Policy";
 
 /* Setting for enabling & disabling link previews. */
-"SETTINGS_LINK_PREVIEWS" = "Link Previews";
+"SETTINGS_LINK_PREVIEWS" = "Send Link Previews";
+
+/* Footer for setting for enabling & disabling link previews. */
+"SETTINGS_LINK_PREVIEWS_FOOTER" = "Previews are supported for Imgur, Instagram, Reddit, and YouTube links.";
+
+/* Header for setting for enabling & disabling link previews. */
+"SETTINGS_LINK_PREVIEWS_HEADER" = "Link Previews";
 
 /* Title for settings activity */
 "SETTINGS_NAV_BAR_TITLE" = "Settings";