diff --git a/apps/frontend/src/components/ui/create-project-version/stages/AddFilesStage.vue b/apps/frontend/src/components/ui/create-project-version/stages/AddFilesStage.vue
index c4661d59b..d6a202948 100644
--- a/apps/frontend/src/components/ui/create-project-version/stages/AddFilesStage.vue
+++ b/apps/frontend/src/components/ui/create-project-version/stages/AddFilesStage.vue
@@ -133,6 +133,8 @@ const addDetectedData = async () => {
 
 	if (projectType.value === 'resourcepack') {
 		draftVersion.value.loaders = ['minecraft']
+	} else if (projectType.value === 'modpack' && draftVersion.value.loaders?.length === 0) {
+		draftVersion.value.loaders = ['minecraft']
 	}
 }
 
diff --git a/packages/api-client/src/modules/labrinth/versions/v3.ts b/packages/api-client/src/modules/labrinth/versions/v3.ts
index 837172260..5b929c462 100644
--- a/packages/api-client/src/modules/labrinth/versions/v3.ts
+++ b/packages/api-client/src/modules/labrinth/versions/v3.ts
@@ -179,9 +179,9 @@ export class LabrinthVersionsV3Module extends AbstractModule {
 			formData.append(fileParts[i], new Blob([file]), file.name)
 		})
 
-		return this.client.request<Labrinth.Versions.v3.Version>(`/version`, {
+		const newVersion = await this.client.request<Labrinth.Versions.v3.Version>(`/version`, {
 			api: 'labrinth',
-			version: 3,
+			version: 2,
 			method: 'POST',
 			body: formData,
 			timeout: 120000,
@@ -189,6 +189,12 @@ export class LabrinthVersionsV3Module extends AbstractModule {
 				'Content-Type': '',
 			},
 		})
+
+		await this.modifyVersion(newVersion.id, {
+			environment: draftVersion.environment,
+		})
+
+		return newVersion
 	}
 
 	/**