Screenshot tool does not work on cosmic-base (looks like the same issue of cosmic-greeter).
makaba@fedora:~$ sudo setenforce 0 && getenforce
setenforce: SELinux is disabled
makaba@fedora:~$ cosmic-screenshot --interactive=false --modal=false
thread 'main' panicked at src/main.rs:69:10:
failed to send screenshot request: Zbus(MethodError(OwnedErrorName(ErrorName(Str(Owned("org.freedesktop.DBus.Error.UnknownMethod")))), Some("No such interface “org.freedesktop.portal.Screenshot” on object at path /org/freedesktop/portal/desktop"), Msg { type: Error, sender: UniqueName(Str(Borrowed(":1.26"))), reply-serial: 17, body: Signature("s") }))
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
makaba@fedora:~$ cosmic-screenshot
thread 'main' panicked at src/main.rs:69:10:
failed to send screenshot request: Zbus(MethodError(OwnedErrorName(ErrorName(Str(Owned("org.freedesktop.DBus.Error.UnknownMethod")))), Some("No such interface “org.freedesktop.portal.Screenshot” on object at path /org/freedesktop/portal/desktop"), Msg { type: Error, sender: UniqueName(Str(Borrowed(":1.26"))), reply-serial: 17, body: Signature("s") }))
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
makaba@fedora:~$