diff --git a/pkg/models/posts.go b/pkg/models/posts.go
index de463dd..7848ef7 100644
--- a/pkg/models/posts.go
+++ b/pkg/models/posts.go
@@ -16,19 +16,19 @@ type PostReactInfo struct {
 type Post struct {
 	BaseModel
 
-	Alias       string                      `json:"alias" gorm:"uniqueIndex"`
-	Content     string                      `json:"content"`
-	Tags        []Tag                       `json:"tags" gorm:"many2many:post_tags"`
-	Categories  []Category                  `json:"categories" gorm:"many2many:post_categories"`
-	Reactions   []Reaction                  `json:"reactions"`
-	Replies     []Post                      `json:"replies" gorm:"foreignKey:ReplyID"`
-	Attachments datatypes.JSONSlice[string] `json:"attachments"`
-	ReplyID     *uint                       `json:"reply_id"`
-	RepostID    *uint                       `json:"repost_id"`
-	RealmID     *uint                       `json:"realm_id"`
-	ReplyTo     *Post                       `json:"reply_to" gorm:"foreignKey:ReplyID"`
-	RepostTo    *Post                       `json:"repost_to" gorm:"foreignKey:RepostID"`
-	Realm       *Realm                      `json:"realm"`
+	Alias       string                    `json:"alias" gorm:"uniqueIndex"`
+	Content     string                    `json:"content"`
+	Tags        []Tag                     `json:"tags" gorm:"many2many:post_tags"`
+	Categories  []Category                `json:"categories" gorm:"many2many:post_categories"`
+	Reactions   []Reaction                `json:"reactions"`
+	Replies     []Post                    `json:"replies" gorm:"foreignKey:ReplyID"`
+	Attachments datatypes.JSONSlice[uint] `json:"attachments"`
+	ReplyID     *uint                     `json:"reply_id"`
+	RepostID    *uint                     `json:"repost_id"`
+	RealmID     *uint                     `json:"realm_id"`
+	ReplyTo     *Post                     `json:"reply_to" gorm:"foreignKey:ReplyID"`
+	RepostTo    *Post                     `json:"repost_to" gorm:"foreignKey:RepostID"`
+	Realm       *Realm                    `json:"realm"`
 
 	PublishedAt *time.Time `json:"published_at"`
 
diff --git a/pkg/server/posts_api.go b/pkg/server/posts_api.go
index 9631c14..2568083 100644
--- a/pkg/server/posts_api.go
+++ b/pkg/server/posts_api.go
@@ -80,7 +80,7 @@ func createPost(c *fiber.Ctx) error {
 		Content     string            `json:"content" form:"content" validate:"required,max=4096"`
 		Tags        []models.Tag      `json:"tags" form:"tags"`
 		Categories  []models.Category `json:"categories" form:"categories"`
-		Attachments []string          `json:"attachments" form:"attachments"`
+		Attachments []uint            `json:"attachments" form:"attachments"`
 		PublishedAt *time.Time        `json:"published_at" form:"published_at"`
 		RealmAlias  string            `json:"realm" form:"realm"`
 		ReplyTo     *uint             `json:"reply_to" form:"reply_to"`
@@ -94,7 +94,7 @@ func createPost(c *fiber.Ctx) error {
 	}
 
 	for _, attachment := range data.Attachments {
-		if !services.CheckAttachmentByUUIDExists(attachment, "i.attachment") {
+		if !services.CheckAttachmentByIDExists(attachment, "i.attachment") {
 			return fiber.NewError(fiber.StatusBadRequest, fmt.Sprintf("attachment %s not found", attachment))
 		}
 	}
@@ -154,7 +154,7 @@ func editPost(c *fiber.Ctx) error {
 		PublishedAt *time.Time        `json:"published_at" form:"published_at"`
 		Tags        []models.Tag      `json:"tags" form:"tags"`
 		Categories  []models.Category `json:"categories" form:"categories"`
-		Attachments []string          `json:"attachments" form:"attachments"`
+		Attachments []uint            `json:"attachments" form:"attachments"`
 	}
 
 	if err := BindAndValidate(c, &data); err != nil {
@@ -170,7 +170,7 @@ func editPost(c *fiber.Ctx) error {
 	}
 
 	for _, attachment := range data.Attachments {
-		if !services.CheckAttachmentByUUIDExists(attachment, "i.attachment") {
+		if !services.CheckAttachmentByIDExists(attachment, "i.attachment") {
 			return fiber.NewError(fiber.StatusBadRequest, fmt.Sprintf("attachment %s not found", attachment))
 		}
 	}
diff --git a/pkg/services/attachments.go b/pkg/services/attachments.go
index 79fb06e..3e90acb 100644
--- a/pkg/services/attachments.go
+++ b/pkg/services/attachments.go
@@ -19,9 +19,9 @@ func GetAttachmentByUUID(uuid string) (*pcpb.Attachment, error) {
 	})
 }
 
-func CheckAttachmentByUUIDExists(uuid string, usage string) bool {
+func CheckAttachmentByIDExists(id uint, usage string) bool {
 	_, err := grpc.Attachments.CheckAttachmentExists(context.Background(), &pcpb.AttachmentLookupRequest{
-		Uuid:  &uuid,
+		Id:    lo.ToPtr(uint64(id)),
 		Usage: &usage,
 	})