diff --git a/api/files.go b/api/files.go
index 2cebff2..a9ab3a2 100644
--- a/api/files.go
+++ b/api/files.go
@@ -27,17 +27,16 @@ func (client *Client) GetFiles(params *GetFilesParams, opts ...Option) ([]*File,
 }
 
 type PostFilesParams struct {
-	File      *InputFile
-	CSRF      string // XXX should not be part of the request
-	Challenge int    // TODO May be additional i.e. pages don't need it
+	Files     []*InputFile // XXX backend code shows it could be a list, but not the doc
+	Challenge int          // TODO May be additional i.e. pages don't need it
 	Location  *string
 }
 
 func (client *Client) PostFiles(params *PostFilesParams, opts ...Option) ([]*File, error) {
 	// Maps parameters to values
 	mp := map[string]any{
-		"file":      params.File,
-		"nonce":     params.CSRF,
+		"file":      params.Files,
+		"nonce":     client.nonce,
 		"challenge": params.Challenge,
 		"type":      "challenge",
 	}
@@ -125,6 +124,20 @@ func encodeMultipart(values map[string]any) (io.Reader, string, error) {
 				}
 				content = file.Content
 			}
+		} else if files, ok := v.([]*InputFile); ok {
+			if files == nil {
+				if fw, err = w.CreateFormFile(k, ""); err != nil {
+					return nil, "", err
+				}
+				content = []byte{}
+			} else {
+				for _, file := range files {
+					if fw, err = w.CreateFormFile(k, file.Name); err != nil {
+						return nil, "", err
+					}
+					content = file.Content
+				}
+			}
 		} else {
 			if fw, err = w.CreateFormField(k); err != nil {
 				return nil, "", err
diff --git a/api/setup_test.go b/api/setup_test.go
index 9feb59b..7abbd5c 100644
--- a/api/setup_test.go
+++ b/api/setup_test.go
@@ -97,9 +97,11 @@ func Test_F_Setup(t *testing.T) {
 
 	// 3. Push a file
 	files, err := client.PostFiles(&api.PostFilesParams{
-		File: &api.InputFile{
-			Name:    "icmp.pcap",
-			Content: []byte("bla bla bla CTFER{flag} bip boop"),
+		Files: []*api.InputFile{
+			{
+				Name:    "icmp.pcap",
+				Content: []byte("bla bla bla CTFER{flag} bip boop"),
+			},
 		},
 		Challenge: chall.ID,
 	})
diff --git a/examples/setup/main.go b/examples/setup/main.go
index 93de8f8..d5c23f3 100644
--- a/examples/setup/main.go
+++ b/examples/setup/main.go
@@ -76,6 +76,24 @@ func main() {
 	}
 	fmt.Printf("    Created challenge %d\n", ch.ID)
 
+	// Add files to it
+	files, err := client.PostFiles(&ctfd.PostFilesParams{
+		Files: []*ctfd.InputFile{
+			{
+				Name:    "file1",
+				Content: []byte(`toto 1`),
+			}, {
+				Name:    "file2",
+				Content: []byte(`toto 2`),
+			},
+		},
+		Challenge: ch.ID,
+	})
+	if err != nil {
+		log.Fatalf("Creating files: %s", err)
+	}
+	fmt.Printf("    Created %d files\n", len(files))
+
 	// Add a flag to solve it
 	fmt.Println("[~] Updating challenge")
 	f, err := client.PostFlags(&ctfd.PostFlagsParams{