diff --git a/internal/app/images.go b/internal/app/images.go
index 95fa300..8a79cf9 100644
--- a/internal/app/images.go
+++ b/internal/app/images.go
@@ -7,16 +7,35 @@ import (
 	"haefelfinger.net/piwigo/DirectoriesToAlbums/internal/pkg/piwigo/category"
 )
 
-func synchronizeImages(fileSystem map[string]*localFileStructure.FilesystemNode, existingCategories map[string]*category.PiwigoCategory) error {
-	findMissingImages()
-	uploadImages()
+func synchronizeImages(context *AppContext, fileSystem map[string]*localFileStructure.FilesystemNode, existingCategories map[string]*category.PiwigoCategory) error {
+
+	imageFiles := getImageList(fileSystem)
+
+	missingFiles := findMissingImages(imageFiles)
+	uploadImages(missingFiles)
+
 	return errors.New("synchronizeImages: NOT IMPLEMENTED")
 }
 
-func findMissingImages() {
+func findMissingImages(imageFiles []string) []string {
+
 	logrus.Warnln("Finding missing images (NotImplemented)")
+
+	return nil
 }
 
-func uploadImages() {
+func uploadImages(missingFiles []string) {
 	logrus.Warnln("Uploading missing images (NotImplemented)")
 }
+
+func getImageList(fileSystem map[string]*localFileStructure.FilesystemNode) []string {
+	imageFiles := []string{}
+
+	for _, file := range fileSystem {
+		if !file.IsDir {
+			imageFiles = append(imageFiles, file.Key)
+		}
+	}
+
+	return imageFiles
+}
diff --git a/internal/pkg/piwigo/picture/query.go b/internal/pkg/piwigo/picture/query.go
new file mode 100644
index 0000000..a07290e
--- /dev/null
+++ b/internal/pkg/piwigo/picture/query.go
@@ -0,0 +1,22 @@
+package picture
+
+import (
+	"github.com/sirupsen/logrus"
+	"haefelfinger.net/piwigo/DirectoriesToAlbums/internal/pkg/piwigo"
+)
+
+func ImageUploadRequired(context *piwigo.PiwigoContext, files []string) (bool, error) {
+
+	for file := range files {
+		logrus.Debug(file)
+	}
+
+	/*
+	http://pictures.haefelfinger.net/ws.php?format=json
+{
+    "md5sum_list": "d327416a83452b91764ed2888a5630a3,6d5f122e2b98bc1a192850e89fc2ae8c,40bfe8dd8349ccdedd4a939f9191cafa"
+}
+	 */
+
+	return false, nil
+}
diff --git a/internal/pkg/piwigo/picture/types.go b/internal/pkg/piwigo/picture/types.go
new file mode 100644
index 0000000..c51acd4
--- /dev/null
+++ b/internal/pkg/piwigo/picture/types.go
@@ -0,0 +1,11 @@
+package picture
+
+type uploadChunkResponse struct {
+	Status string      `json:"stat"`
+	Result interface{} `json:"result"`
+}
+
+type imageExistResponse struct {
+	Stat   string            `json:"stat"`
+	Result map[string]string `json:"result"`
+}
diff --git a/internal/pkg/piwigo/picture/upload.go b/internal/pkg/piwigo/picture/upload.go
new file mode 100644
index 0000000..26eaa57
--- /dev/null
+++ b/internal/pkg/piwigo/picture/upload.go
@@ -0,0 +1,11 @@
+package picture
+
+
+/*
+http://pictures.haefelfinger.net/ws.php?format=json
+{
+    "data": "123456",
+    "original_sum": "1234567",
+    "position": "1"
+}
+ */