diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 00000000..0a2b1769
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,102 @@
+# Contributing to TelDrive
+
+This guide will help you get started with contributing to TelDrive.
+
+## Development Setup
+
+### Prerequisites
+
+- Go (1.19 or later)
+- Node.js (for semver dependency)
+- Git
+- Make
+- PowerShell (for Windows) or Bash (for Unix-like systems)
+
+### Initial Setup
+
+1. Clone the repository:
+```bash
+git clone https://github.com/tgdrive/teldrive.git
+cd teldrive
+```
+
+2. Install dependencies:
+```bash
+make deps
+```
+
+## Building TelDrive
+
+### Complete Build
+To build both frontend and backend:
+```bash
+make build
+```
+
+### Frontend Development
+The frontend is managed in a separate repository ([teldrive-ui](https://github.com/tgdrive/teldrive-ui)). The main repository pulls the latest frontend release during build.
+
+To set up the frontend:
+```bash
+make frontend
+```
+
+### Backend Development
+To build the backend only:
+```bash
+make backend
+```
+
+### Running TelDrive
+After building, run the application:
+```bash
+make run
+```
+
+## Feature Development
+
+1. Create a new branch for your feature:
+```bash
+git checkout -b feature/your-feature-name
+```
+
+2. Generate API Spec:
+```bash
+make gen
+```
+
+## Version Management
+
+We follow semantic versioning (MAJOR.MINOR.PATCH):
+
+- For bug fixes:
+```bash
+make patch-version
+```
+
+- For new features:
+```bash
+make minor-version
+```
+
+- For breaking changes:
+```bash
+make major-version
+```
+
+## Pull Request Guidelines
+
+1. **Branch Naming**:
+   - `feature/` for new features
+   - `fix/` for bug fixes
+   - `docs/` for documentation changes
+   - `refactor/` for code refactoring
+
+2. **Commit Messages**:
+   - Use clear, descriptive commit messages
+   - Reference issues when applicable
+
+3. **Pull Request Description**:
+   - Describe the changes made
+   - Include any relevant issue numbers
+   - List any breaking changes
\ No newline at end of file
diff --git a/Makefile b/Makefile
index b01884bd..0520caef 100644
--- a/Makefile
+++ b/Makefile
@@ -10,10 +10,6 @@ APP_NAME := teldrive
 BUILD_DIR := bin
 FRONTEND_DIR := ui/dist
 FRONTEND_ASSET := https://github.com/tgdrive/teldrive-ui/releases/download/latest/teldrive-ui.zip
-GIT_TAG := $(shell git tag -l '[0-9]*.[0-9]*.[0-9]*' --sort=-v:refname | head -n 1)
-ifeq ($(GIT_TAG),)
-    GIT_TAG := 1.0.0
-endif
 GIT_COMMIT := $(shell git rev-parse --short HEAD)
 GIT_LINK := $(shell git remote get-url origin)
 MODULE_PATH := $(shell go list -m)
@@ -23,7 +19,6 @@ GIT_COMMIT := $(shell git rev-parse --short HEAD)
 VERSION_PACKAGE := $(MODULE_PATH)/internal/version
 VERSION := $(GIT_TAG)
 BINARY_EXTENSION :=
-BUILD_TIME :=
 
 ifeq ($(IS_WINDOWS),true)
     BINARY_EXTENSION := .exe
@@ -32,18 +27,14 @@ ifeq ($(IS_WINDOWS),true)
     MKDIR := powershell -Command "New-Item -ItemType Directory -Force"
     DOWNLOAD := powershell -Command "Invoke-WebRequest -Uri"
     UNZIP := powershell -Command "Expand-Archive"
+	GIT_TAG := $(shell git tag -l '[0-9]*.[0-9]*.[0-9]*' --sort=-v:refname | Sort-Object -Descending | Select-Object -First 1)
 else
     RM := rm -f
     RMDIR := rm -rf
     MKDIR := mkdir -p
     DOWNLOAD := curl -sLO
     UNZIP := unzip -q -d
-endif
-
-ifeq ($(IS_WINDOWS),true)
-    BUILD_TIME := $(shell powershell -Command "(Get-Date).ToUniversalTime().ToString('yyyy-MM-ddTHH:mm:ss.fffZ')")
-else
-    BUILD_TIME := $(shell date -u '+%Y-%m-%dT%H:%M:%S.000Z')
+	GIT_TAG := $(shell git tag -l '[0-9]*.[0-9]*.[0-9]*' --sort=-v:refname | head -n 1)
 endif
 
 .PHONY: all build run clean frontend backend run sync-ui retag patch-version minor-version major-version gen check-semver install-semver
@@ -77,12 +68,8 @@ gen:
 
 backend: gen
 	@echo "Building backend for $(GOOS)/$(GOARCH)..."
-	go build -trimpath \
-		-ldflags "-s -w \
-			-X '$(VERSION_PACKAGE).Version=$(VERSION)' \
-			-X '$(VERSION_PACKAGE).CommitSHA=$(GIT_COMMIT)' \
-			-extldflags=-static" \
-		-o $(BUILD_DIR)/$(APP_NAME)$(BINARY_EXTENSION)
+	go build -trimpath -ldflags "-s -w -X '$(VERSION_PACKAGE).Version=$(GIT_TAG)' -X '$(VERSION_PACKAGE).CommitSHA=$(GIT_COMMIT)' -extldflags=-static" -o $(BUILD_DIR)/$(APP_NAME)$(BINARY_EXTENSION)
+
 
 build: frontend backend
 	@echo "Building complete."
diff --git a/README.md b/README.md
index 2fd35883..fdab02cc 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ By following these guidelines, you contribute to the responsible and effective u
 
 ## Contributing
 
-Feel free to contribute to this project if you have any further ideas.
+Feel free to contribute to this project.See [CONTRIBUTING.md](CONTRIBUTING.md) for more information.
 
 ## Donate
 
diff --git a/internal/reader/reader.go b/internal/reader/reader.go
index abe2b6e4..9421e7eb 100644
--- a/internal/reader/reader.go
+++ b/internal/reader/reader.go
@@ -60,12 +60,16 @@ func NewLinearReader(ctx context.Context,
 	concurrency int,
 ) (io.ReadCloser, error) {
 
+	size := parts[0].Size
+	if file.Encrypted.Value {
+		size = parts[0].DecryptedSize
+	}
 	r := &LinearReader{
 		ctx:         ctx,
 		parts:       parts,
 		file:        file,
 		remaining:   end - start + 1,
-		ranges:      calculatePartByteRanges(start, end, parts[0].Size),
+		ranges:      calculatePartByteRanges(start, end, size),
 		config:      config,
 		client:      client,
 		concurrency: concurrency,