Use

from fastapi import FastAPI, File, UploadFile
from src.utils.load_file.load_request_file import LoadRequestFile

app = FastAPI()

@app.post("/upload")
async def upload_file(file: UploadFile = File(...)):
    loader = LoadRequestFile(
        file,
        allowed_extensions=["txt", "pdf"],
        allowed_mimetypes=["text/plain", "application/pdf"],
        max_size_mb=5,
    )
    result = await loader.load()

    file_bytes = result.bytes
    raw_bytes = file_bytes.getvalue()

    # Exemplo de análise
    print(type(file_bytes))  # BytesIO
    print(len(raw_bytes))    # tamanho em bytes
    print(raw_bytes[:100])   # primeiros 100 bytes do arquivo

    return result.to_dict()

uvicorn src.dev_tools.launch_api:app --reload

curl -X POST "http://127.0.0.1:8000/upload" \
  -H "accept: application/json" \
  -H "Content-Type: multipart/form-data" \
  -F "file=@caminho/do/seu/arquivo.txt"