Short answer
In Aktar's Settings › Destinations, choose Set Up Cloudflare R2…, create the API token Cloudflare offers and paste it. Aktar creates the bucket, turns on public links and saves the destination.
- In Aktar, open Settings › Destinations and choose Set Up Cloudflare R2…, then Open Cloudflare.
- Cloudflare's token page opens with the right permissions already chosen. Create the token and copy it.
- Paste it into Aktar and pick a new or existing bucket and where public links point: the r2.dev address or a subdomain of your own domain on Cloudflare.
- Click Set Up. Aktar creates the bucket, turns on public links, saves the destination and runs Test Connection. The token itself isn't kept.
The full walkthrough with screenshots of every field is in the Cloudflare R2 guide.