public async Task <string> CreateAsync(int studyId, IFormFile studyLogo) { var studyFromDb = await _studyModelService.GetByIdAsync(studyId, UserOperation.Study_Update_Metadata); if (!FileIsCorrectImageFormat(studyLogo)) { throw new ArgumentException("Blob has invalid filename or is not of type png, jpg or bmp."); } string uniqueFileName = Guid.NewGuid().ToString("N") + studyLogo.FileName; await _azureBlobStorageService.UploadFileToBlobContainer(_containerName, uniqueFileName, studyLogo); string oldFileName = studyFromDb.LogoUrl; studyFromDb.LogoUrl = uniqueFileName; await _db.SaveChangesAsync(); if (!String.IsNullOrWhiteSpace(oldFileName)) { _ = await _azureBlobStorageService.DeleteFileFromBlobContainer(_containerName, oldFileName); } return(studyFromDb.LogoUrl); }