If you need to install Nexcloud on Synology first, you need at least 1G memory RAM, to NEXCLOUD work without problems.
- Reset NAS to factory configuration
- Use https://luvis.se/software/install-nextcloud-on-synology-dsm-6/ from luvis.se
- After setup you need to restart synology NAS.
- After restart if you can see nextcloud login at https://<βiPβ> - its Working
If need more help, call me.