> ## Documentation Index > Fetch the complete documentation index at: https://docs.servers.dev/llms.txt > Use this file to discover all available pages before exploring further. # FAQ ## Do I need to change my build? Usually not. The platform reads your Gradle build as it is. You need the Gradle wrapper at the root, and your Ktor servers must listen on the `PORT` env var. See [Ktor servers](https://docs.servers.dev/targets/server.md#listen-on-port). ## Which Gradle and Kotlin versions work? The ones your project uses. The platform builds with your project's Gradle wrapper. ## Does the platform build iOS apps? Yes, as an unsigned simulator app, when a macOS build runner is connected to your org. Signed device builds (`.ipa`) are not available yet. Without a macOS runner the iOS target is skipped and the rest of your project deploys. See [iOS](https://docs.servers.dev/targets/ios.md). ## Does the platform publish to Google Play or the App Store? The platform can upload signed Android App Bundles to the internal testing track of Google Play; see [Google Play](https://docs.servers.dev/targets/android.md#google-play). It does not publish to production tracks or to the App Store. Android and desktop builds are always attached to the deployment as downloads. ## How do I get a signed Android build? Store your keystore and its passwords in four secret env vars. The platform then builds and signs the release APK; without them you get a debug APK. See [Android signing](https://docs.servers.dev/targets/android.md#signing). ## My deployment is PARTIAL. What is live? Every target marked `READY`. The failed targets keep their previous version. Fix them and deploy again. See [Deployments](https://docs.servers.dev/deploy/deployments.md). ## Why was a target SKIPPED? The platform could not build it in this environment, for example an iOS target without a macOS build runner, or an Android target on a self-hosted server without an Android SDK. The reason is shown next to the target. Skipped targets do not make a deployment fail. ## Why does my deployment say "No deployable targets found"? The platform found no Ktor server, web app, Android app or desktop app in the build. Check the rules in [Project structure](https://docs.servers.dev/project-structure.md#how-targets-are-detected). ## Which Ktor server gets my project's main URL? The primary module. By default it is the shallowest Ktor module; set `atoll.primary` to choose. See [The primary module](https://docs.servers.dev/primary-module.md). ## How do I roll back? Run `atoll rollback`, or promote an older deployment with `atoll promote `. See [Promote and rollback](https://docs.servers.dev/deploy/promote-and-rollback.md). ## I changed an env var. Why did nothing happen? Changes apply on the next deployment. To apply them now, deploy again or use **Redeploy production** in the panel's **Env** tab. See [Environment variables](https://docs.servers.dev/configure/environment-variables.md#when-changes-apply). ## Can I see a secret's value again? No. Secret values are write-only. Set a new value if you lost the old one. ## Do previews use my production env vars? No. Previews use the `preview` environment's values. ## Why was my deployment refused? Your org used up a free amount on the free plan, or reached its spend limit. The message says which and links to the **Billing** tab. Add a card or raise the limit there. See [Billing](https://docs.servers.dev/teams/billing.md). ## Why did my app stop? On the free plan, using up the free CPU, memory or bandwidth stops the org's running apps until the next month, or until a card is added. Reaching a spend limit does the same. Apps never stop on their own otherwise. See [What happens at a limit](https://docs.servers.dev/teams/billing.md#what-happens-at-a-limit). ## Can I run the platform myself? Yes. The platform is a single Ktor server that builds and runs apps on a Kubernetes cluster. The [self-hosting guide](https://docs.servers.dev/self-hosting/overview.md) installs it on your own servers. Get in touch through the Enterprise page if you want help with it. ## How do I get help? Email [hello@atoll.app](mailto:hello@atoll.app). This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.