diff --git a/core/settings.go b/core/settings.go
index e29f2bd3..ceb131d2 100644
--- a/core/settings.go
+++ b/core/settings.go
@@ -255,7 +255,7 @@ type S3Config struct {
 // Validate makes S3Config validatable by implementing [validation.Validatable] interface.
 func (c S3Config) Validate() error {
 	return validation.ValidateStruct(&c,
-		validation.Field(&c.Endpoint, is.Host, validation.When(c.Enabled, validation.Required)),
+		validation.Field(&c.Endpoint, is.URL, validation.When(c.Enabled, validation.Required)),
 		validation.Field(&c.Bucket, validation.When(c.Enabled, validation.Required)),
 		validation.Field(&c.Region, validation.When(c.Enabled, validation.Required)),
 		validation.Field(&c.AccessKey, validation.When(c.Enabled, validation.Required)),
diff --git a/core/settings_test.go b/core/settings_test.go
index a5c25a49..a86d43d2 100644
--- a/core/settings_test.go
+++ b/core/settings_test.go
@@ -315,7 +315,19 @@ func TestS3ConfigValidate(t *testing.T) {
 			},
 			true,
 		},
-		// valid data
+		// valid data (url endpoint)
+		{
+			core.S3Config{
+				Enabled:   true,
+				Endpoint:  "https://localhost:8090",
+				Bucket:    "test",
+				Region:    "test",
+				AccessKey: "test",
+				Secret:    "test",
+			},
+			false,
+		},
+		// valid data (hostname endpoint)
 		{
 			core.S3Config{
 				Enabled:   true,
diff --git a/forms/record_upsert.go b/forms/record_upsert.go
index ba21e94c..eaa1d949 100644
--- a/forms/record_upsert.go
+++ b/forms/record_upsert.go
@@ -3,6 +3,7 @@ package forms
 import (
 	"encoding/json"
 	"errors"
+	"fmt"
 	"net/http"
 	"regexp"
 	"strconv"
@@ -316,17 +317,22 @@ func (form *RecordUpsert) processFilesToUpload() error {
 	}
 	defer fs.Close()
 
+	var uploadErrors []error
 	for i := len(form.filesToUpload) - 1; i >= 0; i-- {
 		file := form.filesToUpload[i]
 		path := form.record.BaseFilesPath() + "/" + file.Name()
 
 		if err := fs.Upload(file.Bytes(), path); err == nil {
+			// remove the uploaded file from the list
 			form.filesToUpload = append(form.filesToUpload[:i], form.filesToUpload[i+1:]...)
+		} else {
+			// store the upload error
+			uploadErrors = append(uploadErrors, fmt.Errorf("File %d: %v", i, err))
 		}
 	}
 
-	if len(form.filesToUpload) > 0 {
-		return errors.New("Failed to upload all files.")
+	if len(uploadErrors) > 0 {
+		return fmt.Errorf("Failed to upload all files: %v", uploadErrors)
 	}
 
 	return nil
@@ -347,20 +353,25 @@ func (form *RecordUpsert) processFilesToDelete() error {
 	}
 	defer fs.Close()
 
+	var deleteErrors []error
 	for i := len(form.filesToDelete) - 1; i >= 0; i-- {
 		filename := form.filesToDelete[i]
 		path := form.record.BaseFilesPath() + "/" + filename
 
 		if err := fs.Delete(path); err == nil {
+			// remove the deleted file from the list
 			form.filesToDelete = append(form.filesToDelete[:i], form.filesToDelete[i+1:]...)
+		} else {
+			// store the delete error
+			deleteErrors = append(deleteErrors, fmt.Errorf("File %d: %v", i, err))
 		}
 
 		// try to delete the related file thumbs (if any)
 		fs.DeletePrefix(form.record.BaseFilesPath() + "/thumbs_" + filename + "/")
 	}
 
-	if len(form.filesToDelete) > 0 {
-		return errors.New("Failed to delete all files.")
+	if len(deleteErrors) > 0 {
+		return fmt.Errorf("Failed to delete all files: %v", deleteErrors)
 	}
 
 	return nil