Species- Ferns (families, genera, species)‎ > ‎M---Z‎ > ‎O‎ > ‎Oleandraceae‎ > ‎Oleandra‎ > ‎

Oleandra wallichii

Oleandra wallichii (Hook.) C. Presl, Tent. Pterid. 78 1836. (syn: Aspidium wallichii Hook.; Neuronia asplenioides D.Don; Oleandra wallichii var. lepidota Christ);

India (Himachal Pradesh, Uttarakhand, Sikkim, Meghalaya, Arunachal Pradesh, Assam); Nepal; Bhutan; Myanmar (Kachin, Chin, etc.); China (Sichuan, Yunnan, Guangxi); Taiwan; Tibet; Vietnam; N-Thailand as per Catalogue of Life;

Oleandra wallichii (Hook.) Pr. : 7 posts by 1 author. 6 images- 4 to 6 mb each.
Location: Phulchoki, Lalitpur
Date: 07 October 2020 
Elevation: 2232m.
Habit : Wild

SK 2771 07 October 2020 - Fern : 13 posts by 3 authors. 4 images- 7 mb each.
Location: Nagarkot,  Kathmandu
Date: 12 September 2020
Elevation: 2044 m.
Habit : Wild 
Oleandra wallichii (Hook.) C.Presl ?? 

Sori and Rhizome characters are required 
Not perfect image. 
May also be juvinile Coniogramme or Diplazium javanicum or something else.

Thank you … but looks different both species suggested.
The well developed spores and rhizome could gave some clues. It is very young....could be similar species as suggested by …
But as of young leaf I will go with Oleandra wallichii (Hook.) C. Presl, if it is epiphytic than  Coniogramme or Diplazium, as it is common at that altitude in Central Nepal.