Export from Trasely
Open your route in Trasely, tap Export → GPX, then save the file to Files so it is available in Safari or another browser.
Use Strava Route Builder to turn your exported GPX into a saved Strava route. Do not upload it as a completed activity.
Export GPX from Trasely, open Strava on the web, upload the file in Route Builder, then save it to My Routes.
Open your route in Trasely, tap Export → GPX, then save the file to Files so it is available in Safari or another browser.
In a browser, sign in to Strava and go to Dashboard → My Routes → Create New Route. Use the route upload button in the builder and choose your Trasely GPX file.
After Strava loads the GPX, check the path, adjust route preferences if needed, name the route, and save it. It will appear under My Routes.
Open the saved route in Strava when you are ready to navigate or share it. Avoid the activity upload page, because that creates a completed workout instead of a planned route.
Why this is manual: Strava's public API supports uploading GPX files as activities, but it does not provide a public endpoint for creating Strava Routes from third-party apps.
Reference: Strava uploading route files.