diff --git a/out/production/resources/application.yml b/out/production/resources/application.yml
index 44c4498e..c2ebeda7 100644
--- a/out/production/resources/application.yml
+++ b/out/production/resources/application.yml
@@ -2,3 +2,8 @@ spring:
   profiles:
     active: local
     include: secret
+
+  servlet:
+    multipart:
+      max-file-size: 20MB
+      max-request-size: 20MB
diff --git a/src/main/java/com/sponus/sponusbe/domain/announcement/entity/enums/AnnouncementCategory.java b/src/main/java/com/sponus/sponusbe/domain/announcement/entity/enums/AnnouncementCategory.java
index 83fbaf84..e54364b5 100644
--- a/src/main/java/com/sponus/sponusbe/domain/announcement/entity/enums/AnnouncementCategory.java
+++ b/src/main/java/com/sponus/sponusbe/domain/announcement/entity/enums/AnnouncementCategory.java
@@ -1,5 +1,5 @@
 package com.sponus.sponusbe.domain.announcement.entity.enums;
 
 public enum AnnouncementCategory {
-	IDEA, MARKETING, DESIGN, DEVELOPMENT, OTHER
+	IDEA, MARKETING, DESIGN, MEDIA, DEVELOPMENT, OTHER
 }
diff --git a/src/main/java/com/sponus/sponusbe/domain/notification/entity/Notification.java b/src/main/java/com/sponus/sponusbe/domain/notification/entity/Notification.java
index 6d4bf79a..56bf406a 100644
--- a/src/main/java/com/sponus/sponusbe/domain/notification/entity/Notification.java
+++ b/src/main/java/com/sponus/sponusbe/domain/notification/entity/Notification.java
@@ -75,4 +75,8 @@ public void setAnnouncement(Announcement announcement) {
 	public void setPropose(Propose propose) {
 		this.propose = propose;
 	}
+
+	public void setRead(boolean read) {
+		isRead = read;
+	}
 }
diff --git a/src/main/java/com/sponus/sponusbe/domain/organization/controller/OrganizationController.java b/src/main/java/com/sponus/sponusbe/domain/organization/controller/OrganizationController.java
index b4aac450..3b7a9552 100644
--- a/src/main/java/com/sponus/sponusbe/domain/organization/controller/OrganizationController.java
+++ b/src/main/java/com/sponus/sponusbe/domain/organization/controller/OrganizationController.java
@@ -96,4 +96,12 @@ public ApiResponse<Void> deleteNotification(
 		organizationService.deleteNotification(organization, notificationId);
 		return ApiResponse.onSuccess(null);
 	}
+
+	@PostMapping("/notifications/{notificationId}")
+	public ApiResponse<Void> readNotification(
+		@AuthOrganization Organization organization,
+		@PathVariable("notificationId") Long notificationId) {
+		organizationService.readNotification(organization, notificationId);
+		return ApiResponse.onSuccess(null);
+	}
 }
diff --git a/src/main/java/com/sponus/sponusbe/domain/organization/service/OrganizationService.java b/src/main/java/com/sponus/sponusbe/domain/organization/service/OrganizationService.java
index e4f07bcf..e6c512d7 100644
--- a/src/main/java/com/sponus/sponusbe/domain/organization/service/OrganizationService.java
+++ b/src/main/java/com/sponus/sponusbe/domain/organization/service/OrganizationService.java
@@ -58,14 +58,14 @@ public void deactivateOrganization(Long organizationId) {
 
 	public String sendEmail(String to) throws Exception {
 		String code = createEmailCode();
-		MimeMessage message = createMessage(to, code);
+		MimeMessage message = createEmail(to, code);
 		emailSender.send(message);
 		return code;
 	}
 
-	private MimeMessage createMessage(String to, String code) throws Exception {
-		System.out.println("보내는 대상 : " + to);
-		System.out.println("인증 코드 : " + code);
+	private MimeMessage createEmail(String to, String code) throws Exception {
+		log.info("보내는 대상 : " + to);
+		log.info("인증 코드 : " + code);
 		MimeMessage message = emailSender.createMimeMessage();
 		message.addRecipients(MimeMessage.RecipientType.TO, to); // 보내는 대상
 		message.setSubject("Spon-us 인증 코드 발급입니다."); // 제목
@@ -87,22 +87,21 @@ private MimeMessage createMessage(String to, String code) throws Exception {
 	}
 
 	public static String createEmailCode() {
-		StringBuffer code = new StringBuffer();
+		StringBuilder code = new StringBuilder();
 		Random rnd = new Random();
 
-		for (int i = 0; i < 8; i++) { // 비밀번호 8자리
+		for (int i = 0; i < 6; i++) { // 인증 코드 6자리
 			int index = rnd.nextInt(3); // 0~2 까지 랜덤
-
 			switch (index) {
 				case 0:
-					code.append((char)((int)(rnd.nextInt(26)) + 97));
+					code.append((char)((rnd.nextInt(26)) + 97));
 					//  a~z  (ex. 1+97=98 => (char)98 = 'b')
 					break;
 				case 1:
-					code.append((char)((int)(rnd.nextInt(26)) + 65));
+					code.append((char)((rnd.nextInt(26)) + 65));
 					//  A~Z
 					break;
-				case 2:
+				default:
 					code.append((rnd.nextInt(10)));
 					// 0~9
 					break;
@@ -126,4 +125,13 @@ public void deleteNotification(Organization organization, Long notificationId) {
 		}
 		notificationRepository.delete(notification);
 	}
+
+	public void readNotification(Organization organization, Long notificationId) {
+		Notification notification = notificationRepository.findById(notificationId)
+			.orElseThrow(() -> new NotificationException(NotificationErrorCode.NOTIFICATION_NOT_FOUND));
+		if (!notification.getOrganization().getId().equals(organization.getId())) {
+			throw new NotificationException(NotificationErrorCode.INVALID_ORGANIZATION);
+		}
+		notification.setRead(true);
+	}
 }
diff --git a/src/main/java/com/sponus/sponusbe/domain/s3/S3Service.java b/src/main/java/com/sponus/sponusbe/domain/s3/S3Service.java
index b1537033..633396ae 100644
--- a/src/main/java/com/sponus/sponusbe/domain/s3/S3Service.java
+++ b/src/main/java/com/sponus/sponusbe/domain/s3/S3Service.java
@@ -28,6 +28,7 @@ public String uploadFile(MultipartFile file) {
 			UUID.randomUUID() + file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));
 		ObjectMetadata metadata = new ObjectMetadata();
 		metadata.setContentLength(file.getSize());
+		log.info("[*] File Size : {}", file.getSize());
 		try {
 			amazonS3.putObject(
 				new PutObjectRequest(s3Config.getBucket(), s3Config.getFolder() + filePath, file.getInputStream(),
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 758bb67c..c2ebeda7 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -6,3 +6,4 @@ spring:
   servlet:
     multipart:
       max-file-size: 20MB
+      max-request-size: 20MB